News & Views |
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News & Views |
Mie scattering yields chiral nonlinearity
Nanoscale helix-shaped structures of CdTe are shown to exhibit strong nonlinear chiral effects that could prove useful for high-throughput chemical analysis.
- Yuri Kivshar
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Review Article |
Detecting ionizing radiation using halide perovskite semiconductors processed through solution and alternative methods
X-ray detectors based on solution-processed metal halide perovskites are reviewed. Promising materials, fabrication techniques and device architectures are discussed, as is the potential for medical imaging applications.
- Yihui He
- , Ido Hadar
- & Mercouri G. Kanatzidis
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Letter |
Efficient solid-state photon upconversion enabled by triplet formation at an organic semiconductor interface
Highly efficient upconversion of light by organic semiconductor heterojunction interfaces is demonstrated. This process is enabled by charge separation- and recombination-mediated charge transfer states at the interface.
- Seiichiro Izawa
- & Masahiro Hiramoto
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Letter |
Anomalous upconversion amplification induced by surface reconstruction in lanthanide sublattices
Strong lanthanide-doped upconversion luminescence enhancement is achieved by the use of surface molecules which enhance four-photon upconversion emission. The results may lead to new, highly emissive, nanohybrid systems.
- Hui Xu
- , Sanyang Han
- & Xiaogang Liu
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Comment |
Characterization of stability and challenges to improve lifetime in perovskite LEDs
Low stability of perovskite light-emitting diodes (PeLEDs) is the biggest obstacle to the commercialization of PeLED displays. Here, we cover the current status and challenges in analysing and improving the stability of PeLEDs and suggest some advice that will benefit the community to boost the operational lifetime of PeLEDs.
- Seung-Je Woo
- , Joo Sung Kim
- & Tae-Woo Lee
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Review Article |
Advances in solution-processed near-infrared light-emitting diodes
A summary of recent advances in the near-infrared light-emitting diodes that are fabricated by solution-processed means, with coverage of devices based on organic semiconductors, halide perovskites and colloidal quantum dots.
- Maria Vasilopoulou
- , Azhar Fakharuddin
- & Edward H. Sargent
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Article |
High-precision digital terahertz phase manipulation within a multichannel field perturbation coding chip
A terahertz phase modulator based on the switchable perturbation resonance in two-dimensional electron gas is demonstrated. Phase manipulation with precision ranging from 2° to 5° is obtained at frequencies in the range from 0.26 to 0.27 THz.
- Hongxin Zeng
- , Huajie Liang
- & Daniel M. Mittleman
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Letter |
High-temperature superfluorescence in methyl ammonium lead iodide
A collective coherent quantum many-body phase, namely superfluorescence, is observed in CH3NH3PbI3 at 78 K. The excitation fluence dependence of the spectroscopic features and the population kinetics confirm all its well-known characteristics.
- Gamze Findik
- , Melike Biliroglu
- & Kenan Gundogdu
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Article |
Electrically driven mid-submicrometre pixelation of InGaN micro-light-emitting diode displays for augmented-reality glasses
Submicrometre-sized InGaN-based light-emitting diodes are fabricated by tailored ion implantation. The devices are free from electrical leakage and show a luminance of 7,440 nit at 4.9 A cm−2 even at the line/space scale of 0.5/0.5 μm (= 8,500 ppi).
- Jinjoo Park
- , Jun Hee Choi
- & Sungwoo Hwang
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News & Views |
TADF sensitization targets deep-blue
Two independent studies employing the same narrowband deep-blue emitter, ν-DABNA, but different energy transfer schemes, achieve efficient and stable deep-blue electroluminescence.
- Dongdong Zhang
- & Lian Duan
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Letter |
Organic phosphors with bright triplet excitons for efficient X-ray-excited luminescence
Organic, metal-free materials that act as efficient X-ray scintillators could bring new opportunities for X-ray imaging.
- Xiao Wang
- , Huifang Shi
- & Wei Huang
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Letter |
Stable pure-blue hyperfluorescence organic light-emitting diodes with high-efficiency and narrow emission
Pure-blue organic LEDs with narrow emission and improved stability show promise for display applications.
- Chin-Yiu Chan
- , Masaki Tanaka
- & Chihaya Adachi
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Article |
Comprehensive defect suppression in perovskite nanocrystals for high-efficiency light-emitting diodes
Guanidinium doping is shown to enhance the operation of perovskite nanocrystal light-emitting diodes.
- Young-Hoon Kim
- , Sungjin Kim
- & Tae-Woo Lee
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Article |
Efficient and bright white light-emitting diodes based on single-layer heterophase halide perovskites
Heterophase CsPbI3 perovskite gives rise to bright white phosphor-free LEDs.
- Jiawei Chen
- , Jian Wang
- & Haibo Zeng
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Article |
Efficient and stable organic light-emitting devices employing phosphorescent molecular aggregates
A tetradentate Pd(ii) complex with near unity photoluminescent quantum yield is the basis of bright, long-lifetime organic LEDs.
- Linyu Cao
- , Kody Klimes
- & Jian Li
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Article |
Ultrastrong plasmon–phonon coupling via epsilon-near-zero nanocavities
An epsilon-near-zero medium is used to demonstrate ultrastrong coupling between phonons and gap plasmons. The approach may pave the path to exploitation of vibrational transitions.
- Daehan Yoo
- , Fernando de León-Pérez
- & Sang-Hyun Oh
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News & Views |
Compact design delivers hard X-rays
Beneath a forest in Villigen, Switzerland, a new compact free-electron laser facility is generating brilliant X-ray flashes.
- Makina Yabashi
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Article |
Broadband Mie driven random quasi-phase-matching
Enhanced second-harmonic generation is achieved through random quasi-phase-matching in three-dimensional Mie resonant disordered microspheres realized by the bottom-up assembly of barium titanate nanocrystals.
- Romolo Savo
- , Andrea Morandi
- & Rachel Grange
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News & Views |
Molecular designs offer fast exciton conversion
Two independent studies report new organic compounds that offer record rates of reverse intersystem crossing between triplet and singlet excited states. The result is sky-blue organic light-emitting diodes with improved efficiency, stability and reduced efficiency roll-off.
- Eli Zysman-Colman
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Article |
Tunable free-electron X-ray radiation from van der Waals materials
Tunable X-ray generation, from ultrathin van der Waals materials impacted by relativistic electrons, is demonstrated.
- Michael Shentcis
- , Adam K. Budniak
- & Ido Kaminer
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Review Article |
Variable optical elements for fast focus control
Recent improvements of the operation speed of variable optical elements are reviewed with an emphasis on components with microsecond focus-varying response time.
- SeungYeon Kang
- , Martí Duocastella
- & Craig B. Arnold
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Article |
Organic light emitters exhibiting very fast reverse intersystem crossing
An organic molecule, TpAT-tFFO, which is designed to support rapid reverse intersystem crossing allows the fabrication of efficient organic light-emitting diodes.
- Yoshimasa Wada
- , Hiromichi Nakagawa
- & Hironori Kaji
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Comment |
A truly one-way lane for surface plasmon polaritons
Unidirectional and topological surface plasmon polaritons are currently attracting substantial interest and intense debate. Realistic material models and energy conservation considerations are essential to correctly understand extreme wave effects in non-reciprocal plasmonics, and to assess their potential for novel devices.
- Francesco Monticone
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Article |
Overcoming the energy gap law in near-infrared OLEDs by exciton–vibration decoupling
Pt(ii) complexes allow the fabrication of efficient near-infrared organic light-emitting diodes that operate beyond the 900 nm region.
- Yu-Chen Wei
- , Sheng Fu Wang
- & Pi-Tai Chou
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Article |
High-purity orbital angular momentum states from a visible metasurface laser
A metasurface laser generates orbital angular momentum states with quantum numbers reaching ℓ = 100. Simultaneous output vortex beams, with Δℓ as great as 90, are demonstrated in the visible regime.
- Hend Sroor
- , Yao-Wei Huang
- & Andrew Forbes
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Letter |
Attosecond-fast internal photoemission
Femtosecond laser pulses are sent to a graphene/SiC interface to investigate photoinduced charge transfer from graphene to SiC. A charge transfer time of 300 attoseconds is obtained via laser-pulse-duration-dependent saturation fluence determination.
- Christian Heide
- , Martin Hauck
- & Peter Hommelhoff
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Article |
Bright high-colour-purity deep-blue carbon dot light-emitting diodes via efficient edge amination
Deep-blue high-colour-purity light-emitting materials are developed by using amine-based edge passivation. The light-emitting diodes based on the carbon dots exhibit a maximum luminance of 5,240 cd m–2 and an external quantum efficiency of 4%.
- Fanglong Yuan
- , Ya-Kun Wang
- & Edward H. Sargent
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Editorial |
A question of certification
The certification of solar cells with exceptional performance is now common practice in order to ratify claims. Should similar schemes be introduced for other optoelectronic devices?
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Letter |
Triplet management for efficient perovskite light-emitting diodes
Careful harvesting of triplet excitons allows the realization of efficient green-emitting quasi-2D perovskite LEDs.
- Chuanjiang Qin
- , Toshinori Matsushima
- & Chihaya Adachi
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Letter |
Efficient blue light-emitting diodes based on quantum-confined bromide perovskite nanostructures
Blue light-emitting diodes based on perovskite nanostructures embedded within quasi-two-dimensional phases show highly effective charge injection and suppressed non-radiative recombination.
- Yang Liu
- , Jieyuan Cui
- & Yizheng Jin
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Letter |
Narrowband deep-blue organic light-emitting diode featuring an organoboron-based emitter
A blue emitter based on thermally activated delayed fluorescence is narrowband and efficient.
- Yasuhiro Kondo
- , Kazuki Yoshiura
- & Takuji Hatakeyama
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Article |
Efficient and stable single-layer organic light-emitting diodes based on thermally activated delayed fluorescence
Long-lived, efficient organic light-emitting diodes based on a simple design of a single layer of an active light-emitting medium sandwiched between two contacts and no additional charge injection and transport layers are reported.
- Naresh B. Kotadiya
- , Paul W. M. Blom
- & Gert-Jan A. H. Wetzelaer
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Letter |
Ultra-low-power sub-photon-voltage high-efficiency light-emitting diodes
By using a single-quantum-well active region with a unique well–cladding design to suppress non-radiative recombination and enhance radiative recombination, light-emitting diodes with close to unity internal quantum efficiency at a low current density of <10−4 A cm−2 are demonstrated.
- Ning Li
- , Kevin Han
- & Devendra Sadana
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News & Views |
Colour-tunable ultra-long emission
Ultra-long phosphorescence with an emission colour that can be tuned from violet to green is obtained from an organic phosphor featuring several different emitting centres. Such ‘smart’ materials are promising for applications in displays, sensors and bioimaging.
- Hongwei Wu
- & Yanli Zhao
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Letter |
Colour-tunable ultra-long organic phosphorescence of a single-component molecular crystal
Organic phosphors with ultra-long lifetimes and an emission colour that can be tuned by the excitation wavelength are reported.
- Long Gu
- , Huifang Shi
- & Wei Huang
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Article |
Surface passivation of perovskite film for efficient solar cells
Planar perovskite solar cells that have been passivated using the organic halide salt phenethylammonium iodide are shown to have suppressed non-radiative recombination and operate with a certified power conversion efficiency of 23.3%.
- Qi Jiang
- , Yang Zhao
- & Jingbi You
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Article |
Rational molecular passivation for high-performance perovskite light-emitting diodes
Improved understanding of passivation leads to near-infrared perovskite light-emitting diodes with 21.6% external quantum efficiency.
- Weidong Xu
- , Qi Hu
- & Feng Gao
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Letter |
Tunable plasmons in ultrathin metal films
Nanometre thick metal films enable electrical tuning of plasmons.
- Rinu Abraham Maniyara
- , Daniel Rodrigo
- & Valerio Pruneri
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Letter |
Three-dimensional femtosecond laser nanolithography of crystals
Direct laser writing is shown to dramatically enhance the chemical etch rate of laser crystals yttrium aluminium garnet and sapphire, allowing nanostructuring.
- Airán Ródenas
- , Min Gu
- & Roberto Osellame
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News & Views |
Megafilaments in the mid-infrared
Focusing short CO2 laser pulses into air reveals rich ionization physics that is best explained by solid-state theories and results in centimetre-scale-diameter megafilaments that transport joules of energy.
- Günter Steinmeyer
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Letter |
Experimental quantum fast hitting on hexagonal graphs
A quantum walker on a hexagonal glued array of optical waveguides is made inside a glass substrate. The optimal hitting time increases linearly with the layer depth, giving a quadratic speed-up over the hitting performance by classical random walks.
- Hao Tang
- , Carlo Di Franco
- & Xian-Min Jin
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Article |
Linear frequency conversion via sudden merging of meta-atoms in time-variant metasurfaces
A linear frequency conversion based on the sudden merging of two distinct split-ring resonators into a single resonator on a rapidly time-variant THz metasurface is reported.
- Kanghee Lee
- , Jaehyeon Son
- & Bumki Min
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Letter |
Experimental demonstration of a three-dimensional lithium niobate nonlinear photonic crystal
By selectively erasing the nonlinear coefficients in a lithium niobate crystal using a femtosecond laser, a 3D nonlinear photonic crystal, with an effective conversion efficiency comparable to that of the typical quasi-phase-matching processes, is demonstrated.
- Dunzhao Wei
- , Chaowei Wang
- & Min Xiao