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Direct linearly polarized electroluminescence from perovskite nanoplatelet superlattices
Self-assembled perovskite nanoplatelets emit linearly polarized light, enabling the realization of red perovskite light-emitting diodes with a 74.4% degree of linear polarization.
- Junzhi Ye
- , Aobo Ren
- & Robert L. Z. Hoye
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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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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 |
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 |
Electroluminescence from nanocrystals above 2 µm
Near-infrared emission at around 2 µm is observed from HgTe nanocrystals. LEDs based on this material platform could prove to be a useful low-cost, convenient light source for applications in gas sensing and other tasks.
- Junling Qu
- , Mateusz Weis
- & Emmanuel Lhuillier
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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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News & Views |
Ion implanation success
A new way to define the shape of tiny light-emitting semiconductor pixels provides a means to fabricate arrays of InGaN blue micro-LEDs with a resolution as high as 8,500 pixels per inch.
- Ulrich T. Schwarz
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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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Article |
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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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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Letter |
Unidirectional luminescence from InGaN/GaN quantum-well metasurfaces
Exploiting two-dimensional metamaterials, the direction of emission from InGaN/GaN quantum wells is engineered while simultaneously improving quantum efficiency.
- Prasad P. Iyer
- , Ryan A. DeCrescent
- & Jon. A. Schuller
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Perspective |
Thermophotonic cooling with light-emitting diodes
The status and prospects for using light-emitting diodes as a means of electroluminescent cooling are discussed.
- Toufik Sadi
- , Ivan Radevici
- & Jani Oksanen
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Letter |
Large-area near-infrared perovskite light-emitting diodes
Near-infrared LEDs as large as 30 × 30 mm2 in size are fabricated on both rigid and flexible substrates.
- Xiaofei Zhao
- & Zhi-Kuang Tan
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Article |
Efficient colloidal quantum dot light-emitting diodes operating in the second near-infrared biological window
Semiconductor nanocrystals with efficient tunable emission in the 1,000–1,700 nm window could prove useful for applications in deep biological imaging and sensing.
- Maria Vasilopoulou
- , Hyeong Pil Kim
- & Abd. Rashid bin Mohd Yusoff
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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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Article |
Visible quantum dot light-emitting diodes with simultaneous high brightness and efficiency
Red, green and blue CdSe/ZnSe quantum dot light-emitting diodes combine efficient operation with high brightness.
- Huaibin Shen
- , Qiang Gao
- & Zhenyu Zhang
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News & Views |
The birth of the blue LED
The development of practical blue LEDs required great perseverance by several Japanese scientists who had to learn how to fabricate high-quality films of GaN and effectively dope them to create light-emitting p–n junctions.
- Yasushi Nanishi
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Editorial |
Photonics dominates Nobel Prizes
Awards for blue LEDs and super-resolution microscopy announced.
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News & Views |
Red phosphor converts white LEDs
The development of high-performance red-emitting phosphors provides new opportunities for fabricating white LEDs with both high colour rendering index and high luminous efficacy.
- Xiaoyong Huang
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Article |
High-resolution electroluminescent imaging of pressure distribution using a piezoelectric nanowire LED array
An array of piezoelectric nanowire LEDs with a pixel density of 6,350 dpi is capable of mapping two-dimensional pressure distributions with a spatial resolution of 2.7 micrometres. Pressure alters the light emissions from the LEDs, which are then imaged. Possible applications include artificial skin, robotics and touchpads.
- Caofeng Pan
- , Lin Dong
- & Zhong Lin Wang
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Chiral materials and mechanisms for circularly polarized light-emitting diodes
Efficient microscale emitters