Review Article |
Featured
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Epsilon-near-zero regime enables permanent ultrafast all-optical reversal of ferroelectric polarization
Researchers reveal that naturally emerging epsilon-near-zero conditions in BaTiO3 can be exploited to drive permanent all-optical switching of ferroelectric polarization. The general nature of the epsilon-near-zero regime means that the approach could be used to switch spontaneous order parameters in other systems.
- M. Kwaaitaal
- , D. G. Lourens
- & A. Kirilyuk
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News & Views |
Optical manipulation of spin resonance in gallium nitride
A common direct-bandgap semiconductor has been found to host optically addressable spins, opening the door to scalable quantum sensor manufacturing.
- Jake Horder
- & Igor Aharonovich
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News & Views |
On-chip coherent terahertz emitters with gigahertz modulation
The frequency of coherent terahertz waves radiated from a single superconducting emitter can be electronically modulated on a chip with up to 40 GHz bandwidth, paving the way for high-data-rate and ultrafast terahertz wireless communications.
- Kaveh Delfanazari
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Article |
Laser-driven broadband near-infrared light source with watt-level output
A transparent ceramic phosphor based on Cr3+-doped MgO offers a route to a powerful broadband near-infrared light source.
- Gaochao Liu
- , Weibin Chen
- & Zhiguo Xia
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Article |
Inverse-designed low-index-contrast structures on a silicon photonics platform for vector–matrix multiplication
Using inverse design, a 3D silicon photonics platform that can be used for the mathematical operation of vector–matrix multiplication with light is demonstrated, potentially enabling large-scale wave-based analogue computing.
- Vahid Nikkhah
- , Ali Pirmoradi
- & Nader Engheta
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Article |
Size-dependent lanthanide energy transfer amplifies upconversion luminescence quantum yields
Researchers demonstrate a size-dependent lanthanide energy transfer effect in upconversion nanoparticles with depleted surface quenching, resulting in upconversion quantum yields of 13.0 ± 1.3%.
- Feng Li
- , Langping Tu
- & Guanying Chen
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Article |
Charge trapping for controllable persistent luminescence in organics
Tunable afterglow emission in the visible region is enabled by trap-induced persistent luminescence in organic host–guest materials, with controllable trap depths.
- Cunjian Lin
- , Zishuang Wu
- & Rong-Jun Xie
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Article |
Efficient and stable perovskite solar cells with regulated depletion region
Controlling the doping depth in perovskites allows the creation of a depletion region that inhibits the migration of iodide ions under illumination. Solar cells exhibit a power conversion efficiency of 24.6% and maintain 88% of the initial efficiency after 1,900 h of continuous operation.
- Zhichao Shen
- , Qifeng Han
- & Liyuan Han
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Article |
A conformal mapping approach to broadband nonlinear optics on chip
Conformal transformation optics is exploited to design curved accelerating waveguides with spatially gradient curvatures to boost the nonlinear efficiency and broaden the bandwidth of the nonlinear optical processes in the waveguides.
- Chunyu Huang
- , Yu Luo
- & Hui Liu
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Article |
Super-resolved FRET and co-tracking in pMINFLUX
Super-resolution pMINFLUX microscopy is combined with FRET and enables co-tracking of two fluorophores without photoswitching.
- Fiona Cole
- , Jonas Zähringer
- & Philip Tinnefeld
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Article |
Polariton spin Hall effect in a Rashba–Dresselhaus regime at room temperature
Improved generation and manipulation of pure polariton spin transport over distances of tens of micrometres is a step towards spintronic applications.
- Jie Liang
- , Wen Wen
- & Rui Su
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News & Views |
A bit of gain, electrically injected
Electrical excitation of a perovskite light-emitting diode is shown to contribute to optical gain, a milestone on the path towards a non-epitaxial laser diode.
- Barry P. Rand
- & Noel C. Giebink
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Article |
Phase dimensions resolving of efficient and stable perovskite light-emitting diodes at high brightness
A chemical washing method called solvent sieve is developed to resolve the phase dimension issue of metal halide perovskites. The sieved perovskites demonstrate a record external quantum efficiency of 29.5% and a T50 lifetime of 18.67 h at 12,000 cd m−2; 80% of the device external quantum efficiency lasts for 100 days in the ambient.
- Shuo Ding
- , Qiangqiang Wang
- & Chaoyu Xiang
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Article |
Efficient tin-based perovskite solar cells with trans-isomeric fulleropyrrolidine additives
Two precursor additives improve the performance of tin-based perovskite solar cells, delivering a power conversion efficiency of 15.38% and maintaining 93% of the initial efficiency after 500 h of continuous illumination.
- Jingfu Chen
- , Jiefeng Luo
- & Zhanhua Wei
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Article |
Enhancing the efficiency and stability of blue thermally activated delayed fluorescence emitters by perdeuteration
Molecular perdeuteration of thermally activated delayed fluorescence emitters improves the performance of blue organic light-emitting diodes, enabling a peak external quantum efficiency of 33.1% and a device lifetime to reach 80% of initial luminance of over 1,300 h.
- Tianyu Huang
- , Qi Wang
- & Lian Duan
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Article |
Efficient blue electroluminescence from reduced-dimensional perovskites
Addition of a multifunctional ionic additive in mixed two-dimensional–three-dimensional bromide/chloride perovskites enables efficient blue perovskite LEDs with external quantum efficiency of up to 21.4% and half-lifetime of 129 min at an initial luminance of 100 cd m–2.
- Shuai Yuan
- , Linjie Dai
- & Richard H. Friend
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Article |
Multifunctional entinostat enhances the mechanical robustness and efficiency of flexible perovskite solar cells and minimodules
The organic molecule entinostat improves adhesion between the perovskites and substrates, leading to mechanically robust solar cell minimodules with an area of 9 cm2 and power conversion efficiency of 19%.
- Wenzhan Xu
- , Bo Chen
- & Jinsong Huang
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Article |
Efficient and ultrafast organic scintillators by hot exciton manipulation
Researchers overcome the typical scintillator trade-off between high efficiency and speed. In organic scintillators, researchers drove hot excitons into fast singlet emission states without involving the lowest triplet states, which led to a fast radiative lifetime and strong light yield that may be applicable to ultrafast detection and imaging.
- Xinyuan Du
- , Shan Zhao
- & Jiang Tang
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Article |
Dynamic resonance fluorescence in solid-state cavity quantum electrodynamics
Dynamic resonance fluorescence spectra beyond the Mollow-triplet are observed in a In(Ga)As quantum dot in a micropillar. Multiple side peaks, excitation-induced spectral asymmetry, and cavity filtering effects are experimentally observed and theoretically reproduced by a full quantum model that includes phonon-induced decoherence.
- Shunfa Liu
- , Chris Gustin
- & Jin Liu
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Article |
Switchable interfacial reaction enables bright and stable deep-red perovskite light-emitting diodes
A switchable deprotonation reaction at the interface between the perovskite and electron-transporting layer enables bright deep-red perovskite LEDs emitting at 691 nm with a half-lifetime of about 50.3 h at 100 mA cm–2.
- Jiejun Zeng
- , Xiaoyue Sun
- & Yizheng Jin
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Article |
Surface-defect-passivation-enabled near-unity charge collection efficiency in bromide-based perovskite gamma-ray spectrum devices
Ammonium bromide is shown to passivate deep traps on FAPbBr3 surfaces, improving the charge collection efficiency to near unity in perovskite gamma-ray devices. The approach yielded tenfold improvements in dark current, and the energy resolution of 137Cs spectra acquired using FAPbBr3 detectors was improved from 5.7% to 1.7%.
- Liang Zhao
- , Zhifang Shi
- & Jinsong Huang
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Article
| Open Access
Bright and stable near-infrared lead-free perovskite light-emitting diodes
Controlling the intrinsic doping of lead-free perovskites enables near-infrared LEDs emitting at 948 nm with a peak radiance of 226 W sr–1 m–2 and a half-lifetime of 39.5 h.
- Fanglong Yuan
- , Giulia Folpini
- & Feng Gao
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Article |
Correlated sensing with a solid-state quantum multisensor system for atomic-scale structural analysis
Exploiting the signal correlation between multiple quantum sensors enables measuring overlapping signals from multiple targets, as demonstrated by imaging point defects in a diamond with an accuracy of 1.7 nm.
- Wentao Ji
- , Zhaoxin Liu
- & Jiangfeng Du
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Article |
Electrically assisted amplified spontaneous emission in perovskite light-emitting diodes
Electrically injected charges can effectively contribute to optical gain in perovskite light-emitting diodes under optical and electrical co-excitation.
- Karim Elkhouly
- , Iakov Goldberg
- & Paul Heremans
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Article |
Dipole–dipole-interaction-assisted self-assembly of quantum dots for highly efficient light-emitting diodes
Dipole–dipole interactions in mixed-phase CdZnSeS quantum dots enable the effective orientation of the quantum dots and improved photon out-coupling when employed in a light emitting diode.
- Huaiyu Xu
- , Jiaojiao Song
- & Fengjia Fan
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Review Article |
Body-conformable light-emitting materials and devices
The progress made in developing light-emitting technologies that are wearable, attachable or implantable is reviewed and potential applications and challenges are discussed.
- Zhitao Zhang
- , Yue Wang
- & Chunhai Fan
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Article |
High efficiency warm-white light-emitting diodes based on copper–iodide clusters
Solution-processed copper–iodide clusters are employed as efficient emitters for warm white LEDs with external quantum efficiency of 19.1%.
- Jing-Jing Wang
- , Li-Zhe Feng
- & Hong-Bin Yao
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Article |
Three-dimensional nonlinear optical materials from twisted two-dimensional van der Waals interfaces
Three-dimensional nonlinear optical metamaterials are realized by directly engineering the symmetries of electronic wavefunctions at the atomic scale by stacking individual two-dimensional van der Waals interfaces into a precisely designed three-dimensional configuration.
- Bumho Kim
- , Jicheng Jin
- & Bo Zhen
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News & Views |
Hand-drawing perovskite devices
New conductive and perovskite inks enable hand-drawing of optoelectronic devices with a ballpoint pen on a variety of daily substrates, including paper, textiles and other irregular surfaces.
- Faheem Ershad
- , Wenjing Song
- & Cunjiang Yu
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News & Views |
Spin-selective transitions between quantum Hall states
Platforms enabling control over strong light–matter interactions in optical cavities provide a challenging but promising way to manipulate emergent light–matter hybrids. Spin selectivity of transitions has now been demonstrated in a two-dimensional hole gas microcavity system, paving the way towards the study of new spin physics phenomena in hybrid excitations.
- Hrvoje Buljan
- & Zhigang Chen
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Article |
Improved fatigue behaviour of perovskite solar cells with an interfacial starch–polyiodide buffer layer
Introduction of a starch-based layer inhibits ion migration and repairs defects generated on light/dark cycles in perovskite solar cells. Cells retain 98.0% of the initial power conversion efficiency after 42 illumination cycles, and achieve a certified power conversion efficiency of 23.9%.
- Yu Zhang
- , Qizhen Song
- & Huanping Zhou
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Perspective |
A dive into underwater solar cells
The authors discuss the opportunities and challenges facing underwater photovoltaics.
- Jason A. Röhr
- , B. Edward Sartor
- & André D. Taylor
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Article |
Luminescent concentrator design for displays with high ambient contrast and efficiency
Inefficient filters and overall efficiency are issues for display technology. Luminescent concentrator pixels have been used with CdSe/CdS quantum dot emitters, which enable both colour and polarization filtering, as well as nearly 41% extraction efficiency.
- Osman S. Cifci
- , Mikayla A. Yoder
- & Paul V. Braun
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Article
| Open Access
Single-molecule mid-infrared spectroscopy and detection through vibrationally assisted luminescence
Detecting the vibrations of individual molecules directly in the mid-infrared regime is hindered by thermal noise. Here researchers bypass conventional detectors and upconvert the mid-infrared photons into visible light using molecular bonds, yielding an optical readout for single-molecule vibrational spectroscopy.
- Rohit Chikkaraddy
- , Rakesh Arul
- & Jeremy J. Baumberg
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Article |
Field-driven attosecond charge dynamics in germanium
Attosecond transient reflectivity spectroscopy, in combination with extensive time-dependent density functional theory calculations, is used to study field-driven carrier injection in germanium in the time window of few femtoseconds around pulse overlap, paving a route towards achieving full optical control over charge carriers in semiconductors.
- Giacomo Inzani
- , Lyudmyla Adamska
- & Matteo Lucchini
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Article |
Mid-infrared cascade intraband electroluminescence with HgSe–CdSe core–shell colloidal quantum dots
Intraband electroluminescence (EL) from n-doped core–shell HgSe–CdSe colloidal quantum dots is observed around the wavelength of 5 µm. The measured EL quantum efficiency is 4.5% at the injection current of 2 A cm−2, benefiting from the cascade effect. The power efficiency is 0.05%.
- Xingyu Shen
- , Ananth Kamath
- & Philippe Guyot-Sionnest
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Article |
Handwriting of perovskite optoelectronic devices on diverse substrates
A new approach enables handwriting high-performance perovskite optoelectronic devices with a common ballpoint pen on diverse substrates, including paper, textiles, plastics, rubber and common 3D objects in daily life.
- Junyi Zhao
- , Li-Wei Lo
- & Chuan Wang
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Article |
Engineering the buried interface in perovskite solar cells via lattice-matched electron transport layer
Employing a lattice-matched perovskite oxide as an electron transport layer allows optimizing the buried interface in perovskite solar cells. A maximum power conversion efficiency of 25.17% is achieved. Cells with an initial power conversion efficiency of 24.4% maintain 90% efficiency after operation for 1,000 h.
- Chao Luo
- , Guanhaojie Zheng
- & Qing Zhao
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News & Views |
When MXenes meet terahertz radiation
Ultrathin Ti3C2Tx MXene films can approach the intrinsic thin-film absorption limit across the entire 0.5–10 THz band.
- Ji Liu
- & Valeria Nicolosi
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Article |
Spin-selective strong light–matter coupling in a 2D hole gas-microcavity system
Strong coupling of a 2D hole gas in the quantum Hall state dressed with a microcavity mode is studied, showing that tuning the strength of the magnetic field, and therefore the density of states in the system, can select specific spin-dependent light–matter coupling.
- D. G. Suárez-Forero
- , D. W. Session
- & M. Hafezi
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Article |
Organic optoelectronic synapse based on photon-modulated electrochemical doping
An optoelectronic synapse is realized by incorporating a photoactive layer in an organic electrochemical transistor. Writing and erasing multiple conductance states allow optical signals to be recognized and the learning process of the human brain to be mimicked.
- Ke Chen
- , Hang Hu
- & Jianguo Mei
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Article |
Achieving the full-wavelength phase-matching for efficient nonlinear optical frequency conversion in C(NH2)3BF4
A new nonlinear optical crystal offers efficient harmonic generation in the ultraviolet and deep-ultraviolet regions.
- Miriding Mutailipu
- , Jian Han
- & Shilie Pan
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Review Article |
Integrated optical memristors
Optical analogues of electronic memristors are desirable for applications including photonic artificial intelligence and computing platforms. Here, recent progress on integrated optical memristors is reviewed.
- Nathan Youngblood
- , Carlos A. Ríos Ocampo
- & Harish Bhaskaran
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Article
| Open Access
Stable perovskite single-crystal X-ray imaging detectors with single-photon sensitivity
We show perovskite X-ray detection at zero-voltage bias with operational device stability exceeding one year. Detection efficiency of 88% and noise-equivalent dose of 90 pGyair are obtained with 18 keV X-rays, allowing single-photon-sensitive, low-dose and energy-resolved X-ray imaging.
- Kostiantyn Sakhatskyi
- , Bekir Turedi
- & Maksym V. Kovalenko
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Article
| Open Access
Brilliant whiteness in shrimp from ultra-thin layers of birefringent nanospheres
The strong birefringence of liquid crystalline nanospheres in the body of the Pacific cleaner shrimp enables brilliant whiteness by overcoming undesirable optical crowding effects.
- Tali Lemcoff
- , Lotem Alus
- & Benjamin A. Palmer
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Article |
Ultrathin MXene assemblies approach the intrinsic absorption limit in the 0.5–10 THz band
Ultrathin 10.2-nm-thick (~λ/30,000) Ti3C2Tx MXene assemblies that offer an absorption of 49.2%, which is close to the theoretical limit of 50%, in the range of 0.5–10 THz are reported, benefiting terahertz optoelectronic and photothermoelectric devices.
- Tao Zhao
- , Peiyao Xie
- & Xu Xiao
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Article |
Hydrogen-bond-bridged intermediate for perovskite solar cells with enhanced efficiency and stability
A multifunctional additive modulates the kinetics of perovskite film growth, enabling inverted perovskite solar cells with 24.8% power conversion efficiency and enhanced thermal stability.
- Fengzhu Li
- , Xiang Deng
- & Alex K.-Y. Jen
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Article |
Efficient all-thermally evaporated perovskite light-emitting diodes for active-matrix displays
All-thermal evaporation enables the fabrication of green perovskite LEDs with a peak external quantum efficiency of 16.4%, and active-matrix displays with high resolution and continuous greyscale information.
- Jinghui Li
- , Peipei Du
- & Jiang Tang
Nonreciprocal thermal photonics
The carbon footprint of research papers