On the efficiency roll-off in Perovskite Light Emitting Diodes

TL;DR

This paper presents a comprehensive model for understanding efficiency roll-off in Perovskite LEDs, incorporating thermal and electrical effects, and aligns well with experimental data to identify key limiting phenomena.

Contribution

It introduces a self-consistent modeling framework that captures complex feedback mechanisms affecting PeLED efficiency under high injection conditions.

Findings

Model accurately predicts dark current-voltage characteristics.

Identifies thermal effects as key factors in efficiency roll-off.

Provides insights for device optimization and thermal management.

Abstract

Here, we report a comprehensive modeling framework to unravel the efficiency roll-off in Perovskite light emitting diodes (PeLEDs). Our model self-consistently accounts for a positive feedback mechanism which involves diverse phenomena like temperature-dependent carrier recombination, space charge effects, Joule heating, and thermal transport. Model predictions compare well with experimental results such as dark current-voltage characteristics and efficiency as well as radiance roll-off under high injection conditions. This work identifies key performance limiting phenomena in current state-of-the-art PeLEDs and could be of broad relevance towards device optimization, thermal design, packaging, and operational lifetime.