Pressure-induced non-radiative losses in halide perovskite light-emitting diodes. Issue 35 (30th August 2022)

• Record Type: Journal Article
• Authors: Jung, Young-Kwang; Abdulla, Mayami; Friend, Richard H.; Stranks, Samuel D.; Walsh, Aron
• Is Part Of: Journal of materials chemistry. Volume 10:Issue 35(2022)
• Page Start: 12560
• Page End: 12568
• Publication Date: 2022-08-30
• Subjects: Materials -- Periodicals; Chemistry, Analytic -- Periodicals; Optical materials -- Research -- Periodicals; Electronics -- Materials -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d2tc01490d
• Languages: English
• ISSNs: 2050-7526

Abstract

Abstract : When halide perovskite light-emitting diodes are compressed, the electroluminesence weakens, which is explained by an increase in defect populations. Abstract : The control of non-radiative losses in light-emitting diodes (LEDs) based on metal halide perovskites is crucial to improve device efficiency. Recent studies have shown a correlation between lattice strain and electron–hole recombination. To consolidate the concept, we investigate how external pressure (strain) affects the crystal structure, electronic properties, point defect concentration, and luminescence efficiency of CH3 NH3 PbBr3 . Relativistic first-principles calculations reveal enhanced Rashba splitting and Schottky defect disorder under compression, which produce a pronounced decrease in the electroluminescence peak energy and intensity in operating CH3 NH3 PbBr3 LEDs. The resulting model sheds light on the factors underpinning the intricate strain–property relationships in soft crystalline semiconductors.