Thermal Properties of Polymer Hole-Transport Layers Influence the Efficiency Roll-Off and Stability of Perovskite Light-Emitting Diodes

Lianfeng Zhao, Daniel Astridge, William Gunnarsson, Zhaojian Xu, Jisu Hong, Jonathan Scott, Sara Kacmoli, Khaled Al Kurdi, Stephen Barlow, Seth Marder, Claire Gmachl, Alan Sellinger, Barry Rand

Research output: Contribution to journalArticlepeer-review

15 Scopus Citations

Abstract

While the performance of metal halide perovskite light-emitting diodes (PeLEDs) has rapidly improved in recent years, their stability remains a bottleneck to commercial realization. Here, we show that the thermal stability of polymer hole-transport layers (HTLs) used in PeLEDs represents an important factor influencing the external quantum efficiency (EQE) roll-off and device lifetime. We demonstrate a reduced EQE roll-off, a higher breakdown current density of approximately 6 A cm-2, a maximum radiance of 760 W sr-1 m-2, and a longer device lifetime for PeLEDs using polymer HTLs with high glass-transition temperatures. Furthermore, for devices driven by nanosecond electrical pulses, a record high radiance of 1.23 MW sr-1 m-2 and an EQE of approximately 1.92% at 14.6 kA cm-2 are achieved. Thermally stable polymer HTLs enable stable operation of PeLEDs that can sustain more than 11.7 million electrical pulses at 1 kA cm-2 before device failure.
Original languageAmerican English
Pages (from-to)4785-4792
Number of pages8
JournalNano Letters
Volume23
Issue number11
DOIs
StatePublished - 2023

NREL Publication Number

  • NREL/JA-5900-86598

Keywords

  • device stability
  • EQE roll-off
  • high power
  • perovskite light-emitting devices
  • pulsed operation

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