Highly stable and efficient copper(I) sensitizer for narrowband red organic light-emitting diodes with an operational lifetime (LT95) of up to 3689 h at 1000 cd m−2

Rui Tang, Shuo Xu, Gang Cheng (), Kam-Hung Low, Dongdong Zhang, Lian Duan () and Chi-Ming Che ()
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Rui Tang: Pokfulam Road
Shuo Xu: Pokfulam Road
Gang Cheng: Pokfulam Road
Kam-Hung Low: Pokfulam Road
Dongdong Zhang: Tsinghua University
Lian Duan: Tsinghua University
Chi-Ming Che: Pokfulam Road

Nature Communications, 2025, vol. 16, issue 1, 1-10

Abstract: Abstract Copper-based organic light-emitting diodes (OLEDs) are low-cost alternatives to precious metal-based OLEDs, but currently no such OLEDs can meet the practical requirements for high colour purity, device efficiency, and operational stability. Carbene-Cu(I)-amide emitters reported here exhibited thermally activated delayed fluorescent emission with quantum efficiencies up to 0.90 and radiative decay rates of 2.7 × 106 s−1. These enable blue to near-infrared Cu(I)-OLEDs with high brightness (265,000 cd m−2) and extended LT95 lifetime (3582 hours at 1000 cd m−2). Deuteriation and π-extension of carbazole significantly enhance OLED stability. Cu(I)-sensitized fluorescence OLEDs showed efficient narrowband electroluminescence (λmax 612–614 nm; full-width half maximum of 33–38 nm; maximum external quantum efficiencies reach 21.9%) and prolonged LT95 lifetime (up to 3689 h at 1000 cd m−2). This work highlights earth-abundant metal-based sensitized-OLEDs that exhibit high colour purity and long device lifetime comparable to the best non-iridium metal-based OLEDs.

Date: 2025
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DOI: 10.1038/s41467-025-62867-8

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