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.

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 externa

SUBMITTER: Tang R 

PROVIDER: S-EPMC12368058 | biostudies-literature | 2025 Aug

REPOSITORIES: biostudies-literature