发光
发光二极管
材料科学
量子点
氧化物
二极管
光电子学
氧气
荧光粉
吸附
氢氧化物
光化学
无机化学
物理化学
化学
有机化学
冶金
作者
Shang-Yu Huang,Chen-Pin Yeh,Guanhong Chen,Meng-Chi Liu,Hsueh‐Shih Chen
标识
DOI:10.1021/acsami.8b18558
摘要
We investigated the current unsolved problem of short-term enhancement and long-term decay of the luminescence intensity of quantum dots (QDs)-based light-emitting diodes (LEDs) in applications for lighting and displays, and proved that the interface interaction between the QD surface and atmospheres plays a key role in the QD-LED operation process. It is suggested that the initial luminescence enhancement of QD-LEDs would be caused by the QD surface-adsorbed species, such as ligands and gas molecules, rather than QDs themselves, whereas the luminescence decay is correlated to the interface reactions between QDs and photo-generated reactive oxygen species, which leads to formations of sulfate, hydroxide, and oxide compounds after QDs are illuminated by 450 nm blue light in oxygen and water environments according to surface analysis and theoretic thermodynamic calculations. It was also found that involvement of water in the QD-LED operation can cause crystal merging of QDs possibly because of the surface sulfates in the presence of water.
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