Thermal Properties of Polymer Hole-Transport Layers Influence the Efficiency Roll-off and Stability of Perovskite Light-Emitting Diodes.
basic_science · Level V
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- Record sourced from PubMed, PMID 37220025.
- Also identified by DOI 10.1021/acs.nanolett.3c00148.
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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<sup>-2</sup>, a maximum radiance of 760 W sr<sup>-1</sup> m<sup>-2</sup>, 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<sup>-1</sup> m<sup>-2</sup> and an EQE of approximately 1.92% at 14.6 kA cm<sup>-2</sup> 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<sup>-2</sup> before device failure.