Featured
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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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News & Views |
New nonlinear opportunities in the ultraviolet
A nonlinear optical crystal permits harmonic generation of coherent radiation deep into the ultraviolet, reaching below 200 nm.
- P. Shiv Halasyamani
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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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Letter
| Open AccessSensitive near-infrared circularly polarized light detection via non-fullerene acceptor blends
Non-fullerene acceptors open the way to sensitive organic photodetectors for detecting circularly polarized near-infrared light.
- Li Wan
- , Rui Zhang
- & Feng Gao
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Article
| Open AccessEfficient radioactive gas detection by scintillating porous metal–organic frameworks
Detection of gas radionuclides is limited in sensitivity with present methods, but may be useful in energy, security, medical and other sectors. In this work, gas-concentrating porous scintillating metal–organic frameworks are demonstrated for gas radionuclide detection.
- Matteo Orfano
- , Jacopo Perego
- & Angelo Monguzzi
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Article
| Open AccessBrilliant 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 |
High-yield growth of FACsPbBr3 single crystals with low defect density from mixed solvents for gamma-ray spectroscopy
Centimetre-sized formamidinium-caesium lead bromide (FACsPbBr3) single crystals were grown at high yield from low-purity precursors. High (84%) charge collection efficiency and energy resolution (2.9% for 662 keV 137Cs) for γ-rays were demonstrated.
- Liang Zhao
- , Ying Zhou
- & Jinsong Huang
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Perovskite solar cells based on spiro-OMeTAD stabilized with an alkylthiol additive
The addition of DDT to the spiro-OMeTAD hole transport material enhances the stability of perovskite solar cells to humidity, heat and illumination stress. Fabricated devices exhibit a champion certified power conversion efficiency of 23.1%. Also, the devices could retain 90% of the initial efficiency after 1,000 h of continuous illumination, 97% under moisture stress for 530 h and 91% under 144 h of heat stress.
- Xu Liu
- , Bolin Zheng
- & Martin Green
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Polyatomic molecules with emission quantum yields >20% enable efficient organic light-emitting diodes in the NIR(II) window
A new series of self-assembled Pt(II) complexes with high emission quantum yields enables OLEDs with a maximum emission wavelength of 995 nm and an external quantum efficiency of 4.3%.
- Sheng-Fu Wang
- , Bo-Kang Su
- & Pi-Tai Chou
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Ultrastable near-infrared perovskite light-emitting diodes
Near-infrared perovskite light-emitting diodes with extrapolated device lifespans on the scale of years are achieved by the use of a dipolar molecular stabilizer.
- Bingbing Guo
- , Runchen Lai
- & Dawei Di
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News & Views |
Chiral quantum optics goes electric
The local polarization of light in nanophotonic waveguides changes with the light’s direction of propagation. By electrically controlling the polarization of optically created waveguide-coupled excitons in a two-dimensional semiconductor, researchers demonstrate voltage-controlled routing of photons in an integrated nanophotonic device.
- Arno Rauschenbeutel
- & Philipp Schneeweiss
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Digital photoprogramming of liquid-crystal superstructures featuring intrinsic chiral photoswitches
Chiral liquid-crystal materials with optical properties that can be tuned, erased and reversed offer new opportunities in labelling, displays and anti-counterfeiting.
- Zhigang Zheng
- , Honglong Hu
- & Ben L. Feringa
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Suppression of temperature quenching in perovskite nanocrystals for efficient and thermally stable light-emitting diodes
Fluoride-treated CsPbBr3 nanocrystals emit light with near unity efficiency at temperatures of up to 373 K.
- Mingming Liu
- , Qun Wan
- & Liang Li
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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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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 |
NIR II-responsive photon upconversion through energy migration in an ytterbium sublattice
An ytterbium sublattice in an erbium-sensitized multilayer core–shell structure enables photon upconversion from lanthanide ions under 1,530 nm irradiation.
- Bo Zhou
- , Long Yan
- & Qinyuan Zhang
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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 |
Fast spin-flip enables efficient and stable organic electroluminescence from charge-transfer states
An organic molecule, 5Cz-TRZ, with multiple donor units supports fast reverse intersystem crossing, allowing fabrication of high-performance organic light-emitting diodes.
- Lin-Song Cui
- , Alexander J. Gillett
- & Richard H. Friend
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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 |
Best practices for measuring emerging light-emitting diode technologies
The arrival of light-emitting diodes based on new materials is posing challenges for the characterization and comparison of devices in a trusted and consistent manner. Here we provide some advice and guidelines that we hope will benefit the community.
- Miguel Anaya
- , Barry P. Rand
- & Samuel D. Stranks
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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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Highly efficient blue thermally activated delayed fluorescence emitters based on symmetrical and rigid oxygen-bridged boron acceptors
The discovery of two deep-blue organic emitters of light could aid the development of next-generation organic light-emitting devices.
- Dae Hyun Ahn
- , Si Woo Kim
- & Jang Hyuk Kwon
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Strategies towards rational design of gold(iii) complexes for high-performance organic light-emitting devices
Cyclometalated gold(iii) complexes are shown to offer tunable emission colours spanning from sky-blue to red and enable the fabrication of phosphorescent organic light-emitting devices with high external quantum efficiency and long lifetimes.
- Lok-Kwan Li
- , Man-Chung Tang
- & Vivian Wing-Wah Yam
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Letter |
Spin control in reduced-dimensional chiral perovskites
Spin-polarized photon absorption and photoluminescence are reported in reduced-dimensional chiral perovskite materials. The finding indicates that such materials may in the future be useful as a photonic interface for spintronics.
- Guankui Long
- , Chongyun Jiang
- & Edward H. Sargent
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Hydroxypropyl cellulose photonic architectures by soft nanoimprinting lithography
Biodegradable cellulose-based photonic and plasmonic architectures are fabricated via soft nanoimprinting lithography, and are used for structural colour generation, photoluminescence enhancement and as disposable surface-enhanced Raman scattering substrates.
- André Espinha
- , Camilla Dore
- & Agustín Mihi
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Diboron compound-based organic light-emitting diodes with high efficiency and reduced efficiency roll-off
Organic light-emitting diodes featuring the compounds CzDBA and tBuCzBDA are shown to not only offer high external quantum efficiency, but also minimal reduction in performance at high brightness.
- Tien-Lin Wu
- , Min-Jie Huang
- & Chien-Hong Cheng
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Letter |
Spatially segregated free-carrier and exciton populations in individual lead halide perovskite grains
A study of single grains of lead halide perovskite reveals the presence of both excitons and free charge carriers.
- S. Nah
- , B. Spokoyny
- & E. Harel
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Letter |
Solution-processed organic tandem solar cells with power conversion efficiencies >12%
Careful selection of small-molecule materials provides solution-processed tandem organic solar cells with a boost in efficiency.
- Miaomiao Li
- , Ke Gao
- & Yongsheng Chen
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Interview |
Flat talk
Fengnian Xia from Yale University shares his opinions with Nature Photonics on the status of research into 2D materials and their prospects for commercial applications.
- Rachel Won
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Bulk heterojunction perovskite–PCBM solar cells with high fill factor
Bulk heterojunction perovskite solar cells with a high fill factor are reported.
- Chien-Hung Chiang
- & Chun-Guey Wu
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Efficient inverted polymer solar cells employing favourable molecular orientation
Molecular orientation in polymer solar cells is shown to play an important role in device performance.
- Varun Vohra
- , Kazuaki Kawashima
- & Hideyuki Murata
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Perovskite solar cells with a planar heterojunction structure prepared using room-temperature solution processing techniques
The use of a thin layer of zinc oxide nanoparticles as an electron-transport layer allows flexible perovskite solar cells to be fabricated with a power conversion efficiency as high as 15.7%.
- Dianyi Liu
- & Timothy L. Kelly
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Interview |
Photons and magnetization
Magnets are often electrically activated, but recent research has demonstrated various schemes that can control magnetization using light and photocarriers. Nature Photonics spoke to Petr Němec and Tomas Jungwirth about their recent work on a polarization-independent optical-torque approach.
- David Pile