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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 |
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 |
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 |
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 |
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 |
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
| 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 |
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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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 |
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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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 |
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
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 |
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
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Article |
Sub-picosecond steering of ultrafast incoherent emission from semiconductor metasurfaces
Researchers demonstrate sub-picosecond steering of ultrafast incoherent emission from a light-emitting metasurface. The steering is achieved over a 70° range.
- Prasad P. Iyer
- , Nicholas Karl
- & Igal Brener
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Article |
Highly bright and stable single-crystal perovskite light-emitting diodes
Single-crystal perovskite LEDs exhibit reduced ion migration and Auger recombination and increased device lifetime. Perovskite single-crystals-based LEDs exhibit a maximum brightness of 86,000 cd m−2, a peak EQE of 11.2% and T50 lifetime of 12,500 h at an initial luminance of 100 cd m−2.
- Wenjing Chen
- , Zongming Huang
- & Zhengguo Xiao
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Article |
Gigantic suppression of recombination rate in 3D lead-halide perovskites for enhanced photodetector performance
Researchers decreased the recombination rate in lead-halide perovskite thin films by using plasmonic mirrors and hyperbolic metamaterials. The findings led to a 250% photodetector photoresponsivity increase and may have implications for other optoelectronic devices.
- Kwang Jin Lee
- , Ran Wei
- & Chunlei Guo
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Article |
An efficient solid-solution crystalline organic light-emitting diode with deep-blue emission
A thin-film of crystalline organic semiconductors yields a bright, efficient deep-blue OLED.
- Peifu Sun
- , Dan Liu
- & Donghang Yan
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Article |
Terahertz cyclotron emission from two-dimensional Dirac fermions
Two-dimensional massive and massless Dirac fermions in HgTe/CdHgTe quantum wells yield terahertz Landau emission. The emission frequency is continuously tunable with magnetic field or carrier concentration, over the range from 0.5 to 3 THz.
- S. Gebert
- , C. Consejo
- & F. Teppe
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Article |
Anomalous circularly polarized light emission in organic light-emitting diodes caused by orbital–momentum locking
Circularly polarized light emitted from OLEDs exhibits opposite handedness depending on the propagation direction of the light. Switching the current flow in the OLED also switches the light handedness.
- Li Wan
- , Yizhou Liu
- & Binghai Yan
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News & Views |
Efficient emitters in the NIR-II window
Suppression of exciton–vibration coupling yields organic light-emitting diodes that emit at 1,000 nm in the NIR-II spectral region, which is important for biological imaging.
- Alessandro Minotto
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Article |
Heavy-atom engineering of thermally activated delayed fluorophores for high-performance X-ray imaging scintillators
Heavy atoms like Cl, Br and I introduced into thermally activated delayed fluorescence chromophores can increase the X-ray absorption cross-section. Light yield of ~20,000 photons MeV–1, detection limit of 45.5 nGy s−1 and imaging resolution of >18.0 line pairs per millimetre is demonstrated.
- Jian-Xin Wang
- , Luis Gutiérrez-Arzaluz
- & Omar F. Mohammed
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Article |
Efficient and stable one-micrometre-thick organic light-emitting diodes
One-micrometre-thick OLEDs with low operating voltages of 5.11 V, 3.55 V and 6.88 V at 1,000 cd cm–2 for red, green and blue devices, respectively, and long lifetimes (55,000 h, 18,000 h and 1,600 h, respectively) are realized.
- Guanhao Liu
- , Zhiyi Li
- & Ying Wang
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Article |
Efficient selenium-integrated TADF OLEDs with reduced roll-off
Green OLEDs based on BNSeSe offer high operational efficiency and reduced efficiency roll-off.
- Yu Xuan Hu
- , Jingsheng Miao
- & Chuluo Yang
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Article |
Bright short-wavelength infrared organic light-emitting devices
Organic LEDs based on acceptor–donor–acceptor molecules Y11, IDSe-4Cl and COTIC-4F are shown to be highly effective emitters of short-wave infrared light.
- Yuan Xie
- , Wansheng Liu
- & Yong Cao
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Article
| Open Access
In-fibre second-harmonic generation with embedded two-dimensional materials
In-fibre second-harmonic generation is demonstrated in all-silica optical fibres by growing MoS2 monolayers directly onto the fibre’s core.
- Gia Quyet Ngo
- , Emad Najafidehaghani
- & Falk Eilenberger
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News & Views |
Ferroelectric nanosheets boost nonlinearity
Multilayered ferroelectric NbOI2 crystals with sub-100-nm thickness exhibit efficient second harmonic generation, paving the way for on-chip nonlinear optical components.
- Rupert F. Oulton
- , Jefferson Flórez
- & Alex S. Clark
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Article |
Sub-50-ns ultrafast upconversion luminescence of a rare-earth-doped nanoparticle
A tilted plasmonic nanocavity enables shortening of the luminescence decay time of a rare-earth-doped nanoparticle to sub-50 ns. High quantum efficiency enhancement, chiral polarization and directional far-field emission are maintained.
- Huan Chen
- , Zihe Jiang
- & Hongxing Xu
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Article |
Incoherent broadband mid-infrared detection with lanthanide nanotransducers
Lanthanide nanotransducers are developed to detect broadband incoherent mid-infrared radiation in the 4–11 μm spectral window by ratiometric luminescence measurements.
- Liangliang Liang
- , Chongwu Wang
- & Xiaogang Liu
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Article |
Giant second-harmonic generation in ferroelectric NbOI2
Strained NbOI2 flakes with a thickness of 20 nm exhibit a record SHG absolute conversion efficiency of >0.2% and an effective bulk-like nonlinear susceptibility of 1.1 × 10−9 m V−1 at the fundamental wavelength of 1,050 nm. The spatial profile of the polarized second-harmonic generation response can be tuned by the fundamental wavelength.
- Ibrahim Abdelwahab
- , Benjamin Tilmann
- & Kian Ping Loh
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Article |
Solution-processed green and blue quantum-dot light-emitting diodes with eliminated charge leakage
A new strategy to reduce charge leakage in quantum-dot light-emitting diodes enables high external quantum efficiencies of 28.7% and 21.9% and excellent T95 lifetimes of 580,000 h and 4,400 h for green and blue devices, respectively.
- Yunzhou Deng
- , Feng Peng
- & Yizheng Jin
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Article |
Cavity-enhanced linear dichroism in a van der Waals antiferromagnet
Researchers use spin-charge coupling and FePS3 crystals to induce large in-plane optical anisotropy and near-unity linear dichroism in the visible–near-infrared range.
- Huiqin Zhang
- , Zhuoliang Ni
- & Deep Jariwala
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Letter |
Topological-cavity surface-emitting laser
Researchers demonstrate a topological-cavity surface-emitting laser with a 10 W peak power and sub-degree beam divergence at 1,550 nm wavelength. The system is also capable of multiple-wavelength arrays.
- Lechen Yang
- , Guangrui Li
- & Ling Lu
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News & Views |
Chiral switches bring new twist to photonics
A liquid crystal doped with a diarylethene enantiomer can be switched by light into stable reflection states of different colour, creating new opportunities for lasing and labelling.
- Bohan Chen
- , Zimo Zhao
- & Stephen M. Morris
Nonreciprocal thermal photonics