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

Authors:
Open Access
Publisher website
Google Scholar
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.
Funding Information
  • National Research Foundation of Korea (NRF-2016R1A3B1908431, 2018M3D1A1058536)
  • Seoul National University (Research Resettlement Fund)
  • BK21PLUS SNU Materials Division for Educating Creative Global Leaders (21A201319 12052)

This publication has 151 references indexed in Scilit: