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

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

Research output: Contribution to journalArticlepeer-review

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 languageEnglish (US)
Pages (from-to)4785-4792
Number of pages8
JournalNano Letters
Volume23
Issue number11
DOIs
StatePublished - Jun 14 2023

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

Keywords

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

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