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Enhancing photoluminescence quantum efficiency of metal halide perovskites by examining luminescence-limiting factors

Cited 8 time in Web of Science Cited 8 time in Scopus
Authors
Jang, Hyun Myung; Kim, Joo-Sung; Heo, Jung-Min; Lee, Tae-Woo
Issue Date
2020-02
Citation
APL Materials, Vol.8 No.2, p. 020904
Abstract
Metal halide perovskites (MHPs) show superior optoelectronic properties, which give them the great potential for use in next generation light-emitting diodes (LEDs). In particular, their narrow emission linewidths can achieve ultrahigh color purity. However, the reported luminescence efficiency (LE) values are not high enough to be commercialized in displays and solid-state lightings. Moreover, the operational stability of LEDs associated with the overshooting of luminance and the high relative standard deviation of reported external quantum efficiencies are still problematic. In this perspective, we review photophysical factors that limit the photoluminescence quantum efficiency of perovskite-based LEDs. These factors are categorized into (i) weak exciton binding, (ii) nonradiative recombinations, (iii) slow cooling of long-lived hot carriers, (iv) deep-level defects, and (v) interband transition rates. We then present various physicochemical methods to effectively overcome these luminescence-limiting factors. We finally suggest some useful research directions to further improve the LE of MHP emitters as core components in displays and solid-state lightings.
ISSN
2166-532X
URI
https://hdl.handle.net/10371/171783
DOI
https://doi.org/10.1063/1.5136308
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Material Science and Engineering (재료공학부) Journal Papers (저널논문_재료공학부)
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