期刊
ADVANCED OPTICAL MATERIALS
卷 10, 期 16, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adom.202200518
关键词
light-emitting devices; perovskites; scanning electron microscope
资金
- National Key Research and Development Program [2017YFE0120400]
- National Natural Science Foundation of China [61674074, 61875082, 61405089, 62005115]
- Key-Area Research and Development Program of Guangdong Province [2019B010925001, 2019B010924001]
- Guangdong University Key Laboratory for Advanced Quantum Dot Displays and Lighting [2017KSYS007]
- Guangdong-Hong Kong-Macao Joint Laboratory [2019B121205001]
- Shenzhen Peacock Team Project [KQTD2016030111203005]
- Shenzhen Key Laboratory for Advanced Quantum Dot Displays and Lighting [ZDSYS201707281632549]
In this study, the phase distribution on the quasi-2D perovskite surfaces is identified using the charging effect during SEM measurement. Compositional and antisolvent engineering techniques are adopted to improve the quality of perovskite films, resulting in green PeLEDs with high external quantum efficiency (>20%).
The performance of quasi-2D perovskite light-emitting devices (PeLEDs) has been greatly improved in the past several years. Characterizations such as transient absorption (TA) spectroscopy and absorption spectra have been widely adopted to confirm the phases in the quasi-2D perovskite layers. However, all the above-mentioned characterization techniques could only identify the n values of phases without providing information on the distribution of phases. Here, phase distributions on the quasi-2D perovskite surfaces are identified by utilizing the charging effect during the scanning electron microscope (SEM) measurement. Then, compositional and antisolvent engineering are adopted to improve the quality of quasi-2D perovskite films. Green PeLEDs with an external quantum efficiency (EQE) of >20% are achieved with more uniform condensed film morphology and proper phase distribution. The work shows that SEM measurement is a powerful tool for studying the phase distribution on the quasi-2D perovskite surfaces.
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