Degradation Mechanism of Perovskite Light‐Emitting Diodes: An In Situ Investigation via Electroabsorption Spectroscopy and Device Modelling

2020 ◽  
Vol 30 (19) ◽  
pp. 1910464 ◽  
Author(s):  
Yuwei Guo ◽  
Yongheng Jia ◽  
Nan Li ◽  
Mengyu Chen ◽  
Sujuan Hu ◽  
...  
Keyword(s):  
Light Emitting Diodes ◽  
Degradation Mechanism ◽  
Light Emitting ◽  
In Situ Investigation ◽  
Electroabsorption Spectroscopy ◽  
Device Modelling

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.

In situ investigation of energy transfer in hybrid organic/colloidal quantum dot light-emitting diodes via magneto-electroluminescence

2016 ◽  
Vol 18 (32) ◽  
pp. 22373-22378 ◽  
Author(s):  
Lixiang Chen ◽  
Qiusong Chen ◽  
Yanlian Lei ◽  
Weiyao Jia ◽  
De Yuan ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Quantum Dot ◽  
Efficient Method ◽  
Light Emitting Diodes ◽  
Light Emitting ◽  
Inorganic Composites ◽  
Highly Sensitive ◽  
In Situ Investigation ◽  
Colloidal Quantum Dot

Magneto-electroluminescence (MEL) could be a highly sensitive fingerprint for energy transfer, which provides a facile and efficient method for thein situinvestigation of fundamental processes in the hybrid organic/colloidal QD-LEDs and other organic/inorganic composites.

scholarly journals Dimension control of in situ fabricated CsPbClBr2 nanocrystal films toward efficient blue light-emitting diodes

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Chenhui Wang ◽  
Dengbao Han ◽  
Junhui Wang ◽  
Yingguo Yang ◽  
Xinyue Liu ◽  
...  
Keyword(s):  
Quantum Well ◽  
Light Emitting Diodes ◽  
Blue Emission ◽  
Light Emitting ◽  
Mixed Ligands ◽  
Dimension Control ◽  
Nanocrystal Films ◽  
Width Distribution ◽  
Quantum Well Width

AbstractIn the field of perovskite light-emitting diodes (PeLEDs), the performance of blue emissive electroluminescence devices lags behind the other counterparts due to the lack of fabrication methodology. Herein, we demonstrate the in situ fabrication of CsPbClBr2 nanocrystal films by using mixed ligands of 2-phenylethanamine bromide (PEABr) and 3,3-diphenylpropylamine bromide (DPPABr). PEABr dominates the formation of quasi-two-dimensional perovskites with small-n domains, while DPPABr induces the formation of large-n domains. Strong blue emission at 470 nm with a photoluminescence quantum yield up to 60% was obtained by mixing the two ligands due to the formation of a narrower quantum-well width distribution. Based on such films, efficient blue PeLEDs with a maximum external quantum efficiency of 8.8% were achieved at 473 nm. Furthermore, we illustrate that the use of dual-ligand with respective tendency of forming small-n and large-n domains is a versatile strategy to achieve narrow quantum-well width distribution for photoluminescence enhancement.

Excitonic Creation of Highly Luminescent Defects In Situ in Working Organic Light-Emitting Diodes

2017 ◽  
Vol 6 (2) ◽  
pp. 1700856 ◽  
Author(s):  
Yong-Biao Zhao ◽  
Grayson L. Ingram ◽  
Xi-Wen Gong ◽  
Xi-Yan Li ◽  
Li-Na Quan ◽  
...  
Keyword(s):  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Organic Light

scholarly journals Suppressing the Initial Growth of Sidewall GaN by Modifying Micron-Sized Patterned Sapphire Substrate with H3PO4-Based Etchant

Micromachines ◽  
2018 ◽  
Vol 9 (12) ◽  
pp. 622 ◽  
Author(s):  
Wen-Yang Hsu ◽  
Yuan-Chi Lian ◽  
Pei-Yu Wu ◽  
Wei-Min Yong ◽  
Jinn-Kong Sheu ◽  
...  
Keyword(s):  
Sapphire Substrate ◽  
Light Emitting Diodes ◽  
Ex Situ ◽  
Initial Growth ◽  
Patterned Sapphire Substrate ◽  
Light Emitting ◽  
Sapphire Substrates ◽  
Patterned Sapphire Substrates

Micron-sized patterned sapphire substrates (PSS) are used to improve the performance of GaN-based light-emitting diodes (LEDs). However, the growth of GaN is initiated not only from the bottom c-plane but also from the sidewall of the micron-sized patterns. Therefore, the coalescence of these GaN crystals creates irregular voids. In this study, two kinds of nucleation layers (NL)—ex-situ AlN NL and in-situ GaN NL—were used, and the growth of sidewall GaN was successfully suppressed in both systems by modifying the micron-sized PSS surface.

In Situ Fabrication of Bendable Microscale Hexagonal Pyramids Array Vertical Light Emitting Diodes with Graphene as Stretchable Electrical Interconnects

ACS Photonics ◽  
2014 ◽  
Vol 1 (5) ◽  
pp. 421-429 ◽  
Author(s):  
Liancheng Wang ◽  
Jun Ma ◽  
Zhiqiang Liu ◽  
Xiaoyan Yi ◽  
Hongwei Zhu ◽  
...  
Keyword(s):  
Light Emitting Diodes ◽  
Light Emitting ◽  
In Situ Fabrication ◽  
Electrical Interconnects

scholarly journals Optical Patterning: Direct Optical Patterning of Quantum Dot Light‐Emitting Diodes via In Situ Ligand Exchange (Adv. Mater. 46/2020)

2020 ◽  
Vol 32 (46) ◽  
pp. 2070346
Author(s):  
Himchan Cho ◽  
Jia‐Ahn Pan ◽  
Haoqi Wu ◽  
Xinzheng Lan ◽  
Igor Coropceanu ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Ligand Exchange ◽  
Light Emitting Diodes ◽  
Light Emitting ◽  
Optical Patterning

In Situ Ligand Bonding Management of CsPbI 3 Perovskite Quantum Dots Enables High‐Performance Photovoltaics and Red Light‐Emitting Diodes

2020 ◽  
Vol 59 (49) ◽  
pp. 22230-22237 ◽  
Author(s):  
Junwei Shi ◽  
Fangchao Li ◽  
Yan Jin ◽  
Cheng Liu ◽  
Ben Cohen‐Kleinstein ◽  
...  
Keyword(s):  
Quantum Dots ◽  
High Performance ◽  
Light Emitting Diodes ◽  
Red Light ◽  
Light Emitting ◽  
Perovskite Quantum Dots

Efficient orange-red phosphorescent organic light-emitting diodes using an in situ synthesized copper(i) complex as the emitter

2014 ◽  
Vol 2 (31) ◽  
pp. 6333-6341 ◽  
Author(s):  
Feng Wei ◽  
Jacky Qiu ◽  
Xiaochen Liu ◽  
Jianqiang Wang ◽  
Huibo Wei ◽  
...  
Keyword(s):  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Organic Light

Orange-red phosphorescent organic light-emitting diodes with inexpensive and eco-friendly luminescent Cu(i) complexes as the emitter are successfully realized by a codeposition method

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