High Quality CsPbI 3− x Br x Thin Films Enabled by Synergetic Regulation of Fluorine Polymers and Amino Acid Molecules for Efficient Pure Red Light Emitting Diodes

2020 ◽  
pp. 2001684
Author(s):  
Kun‐Hua Wang ◽  
Li Wang ◽  
Yu‐Ying Liu ◽  
Yong‐Hui Song ◽  
Yi‐Chen Yin ◽  
...  
Keyword(s):  
Thin Films ◽  
Amino Acid ◽  
Light Emitting Diodes ◽  
Red Light ◽  
High Quality ◽  
Light Emitting

scholarly journals Perovskite-molecule composite thin films for efficient and stable light-emitting diodes

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Heyong Wang ◽  
Felix Utama Kosasih ◽  
Hongling Yu ◽  
Guanhaojie Zheng ◽  
Jiangbin Zhang ◽  
...  
Keyword(s):  
Thin Films ◽  
High Efficiency ◽  
Light Emitting Diodes ◽  
Degradation Mechanism ◽  
Deep Understanding ◽  
Significant Progress ◽  
High Quality ◽  
Composite Thin Films ◽  
Light Emitting

AbstractAlthough perovskite light-emitting diodes (PeLEDs) have recently experienced significant progress, there are only scattered reports of PeLEDs with both high efficiency and long operational stability, calling for additional strategies to address this challenge. Here, we develop perovskite-molecule composite thin films for efficient and stable PeLEDs. The perovskite-molecule composite thin films consist of in-situ formed high-quality perovskite nanocrystals embedded in the electron-transport molecular matrix, which controls nucleation process of perovskites, leading to PeLEDs with a peak external quantum efficiency of 17.3% and half-lifetime of approximately 100 h. In addition, we find that the device degradation mechanism at high driving voltages is different from that at low driving voltages. This work provides an effective strategy and deep understanding for achieving efficient and stable PeLEDs from both material and device perspectives.

Vacuum‐Assisted Preparation of High‐Quality Quasi‐2D Perovskite Thin Films for Large‐Area Light‐Emitting Diodes

2021 ◽  
pp. 2107644
Author(s):  
Chaoran Chen ◽  
Linxiang Zeng ◽  
Zhengyan Jiang ◽  
Zhenhua Xu ◽  
Yijun Chen ◽  
...  
Keyword(s):  
Thin Films ◽  
Light Emitting Diodes ◽  
Large Area ◽  
High Quality ◽  
Light Emitting

Facile Assembly of High-Quality Organic-Inorganic Hybrid Perovskite Quantum Dot Thin Films for Bright Light-Emitting Diodes

2018 ◽  
Vol 28 (11) ◽  
pp. 1705189 ◽  
Author(s):  
Xiangcheng Jin ◽  
Xiujuan Zhang ◽  
Huan Fang ◽  
Wei Deng ◽  
Xiuzhen Xu ◽  
...  
Keyword(s):  
Thin Films ◽  
Quantum Dot ◽  
Light Emitting Diodes ◽  
Bright Light ◽  
High Quality ◽  
Inorganic Hybrid ◽  
Light Emitting ◽  
Hybrid Perovskite

scholarly journals Understanding the luminescent nature of organic radicals for efficient doublet emitters and pure-red light-emitting diodes

2020 ◽  
Vol 19 (11) ◽  
pp. 1224-1229 ◽  
Author(s):  
Alim Abdurahman ◽  
Timothy J. H. Hele ◽  
Qinying Gu ◽  
Jiangbin Zhang ◽  
Qiming Peng ◽  
...  
Keyword(s):  
Light Emitting Diodes ◽  
Red Light ◽  
Organic Radicals ◽  
Light Emitting

Enhanced Cyan Emission and Optical Tuning of Ca 3 Ga 4 O 9 :Bi 3+ for High‐Quality Full‐Spectrum White Light‐Emitting Diodes

2020 ◽  
Vol 8 (22) ◽  
pp. 2001037 ◽  
Author(s):  
Dongjie Liu ◽  
Xiaohan Yun ◽  
Guogang Li ◽  
Peipei Dang ◽  
Maxim S. Molokeev ◽  
...  
Keyword(s):  
White Light ◽  
Light Emitting Diodes ◽  
High Quality ◽  
Full Spectrum ◽  
Light Emitting ◽  
White Light Emitting Diodes

scholarly journals Red Light-Emitting Diodes with All-Inorganic CsPbI3/TOPO Composite Nanowires Color Conversion Films

2020 ◽  
Vol 15 (1) ◽  
Author(s):  
Lung-Chien Chen ◽  
Yi-Tsung Chang ◽  
Ching-Ho Tien ◽  
Yu-Chun Yeh ◽  
Zong-Liang Tseng ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Light Emitting Diode ◽  
Red Light ◽  
Trioctylphosphine Oxide ◽  
Optical And Electrical Properties ◽  
Colloidal Solutions ◽  
High Quality ◽  
Light Emitting ◽  
Hot Injection ◽  
Color Conversion

AbstractThis work presents a method for obtaining a color-converted red light source through a combination of a blue GaN light-emitting diode and a red fluorescent color conversion film of a perovskite CsPbI3/TOPO composite. High-quality CsPbI3 quantum dots (QDs) were prepared using the hot-injection method. The colloidal QD solutions were mixed with different ratios of trioctylphosphine oxide (TOPO) to form nanowires. The color conversion films prepared by the mixed ultraviolet resin and colloidal solutions were coated on blue LEDs. The optical and electrical properties of the devices were measured and analyzed at an injection current of 50 mA; it was observed that the strongest red light intensity was 93.1 cd/m2 and the external quantum efficiency was 5.7% at a wavelength of approximately 708 nm when CsPbI3/TOPO was 1:0.35.

scholarly journals Two-dimensional perovskites with alternating cations in the interlayer space for stable light-emitting diodes

Nanophotonics ◽  
2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Yiyue Zhang ◽  
Masoumeh Keshavarz ◽  
Elke Debroye ◽  
Eduard Fron ◽  
Miriam Candelaria Rodríguez González ◽  
...  
Keyword(s):  
Thin Films ◽  
Near Infrared ◽  
Light Emitting Diodes ◽  
Interlayer Space ◽  
High Current Density ◽  
Operational Stability ◽  
Infrared Light ◽  
Two Dimensional ◽  
Commercial Development ◽  
Light Emitting

Abstract Lead halide perovskites have attracted tremendous attention in photovoltaics due to their impressive optoelectronic properties. However, the poor stability of perovskite-based devices remains a bottleneck for further commercial development. Two-dimensional perovskites have great potential in optoelectronic devices, as they are much more stable than their three-dimensional counterparts and rapidly catching up in performance. Herein, we demonstrate high-quality two-dimensional novel perovskite thin films with alternating cations in the interlayer space. This innovative perovskite provides highly stable semiconductor thin films for efficient near-infrared light-emitting diodes (LEDs). Highly efficient LEDs with tunable emission wavelengths from 680 to 770 nm along with excellent operational stability are demonstrated by varying the thickness of the interlayer spacer cation. Furthermore, the best-performing device exhibits an external quantum efficiency of 3.4% at a high current density (J) of 249 mA/cm2 and remains above 2.5% for a J up to 720 mA cm−2, leading to a high radiance of 77.5 W/Sr m2 when driven at 6 V. The same device also shows impressive operational stability, retaining almost 80% of its initial performance after operating at 20 mA/cm2 for 350 min. This work provides fundamental evidence that this novel alternating interlayer cation 2D perovskite can be a promising and stable photonic emitter.

Synthesis and Characterization of Thieno[3,4-b]pyrazine Materials for Solution-processible Organic Red Light-emitting Diodes

2011 ◽  
Vol 40 (4) ◽  
pp. 417-419 ◽  
Author(s):  
Qing Li ◽  
Jiuyan Li ◽  
Lijun Deng ◽  
Qian Wang ◽  
Zhanxian Gao ◽  
...  
Keyword(s):  
Light Emitting Diodes ◽  
Red Light ◽  
Synthesis And Characterization ◽  
Light Emitting
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