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Gold(I) Multi‐Resonance Thermally Activated Delayed Fluorescent Emitters for Highly Efficient Ultrapure‐Green Organic Light‐Emitting Diodes

A simple gold(I) coordination strategy affords highly efficient narrowband green and blue multi-resonance thermally activated delayed fluorescence with emission quantum yields of ca. 0.9 and considerably shortened lifetimes down to 5.5 μs. The resultant AuI emitters deliver ultrapure-green OLEDs with external quantum efficiencies of up to 30.3 %, alongside diminished roll-offs as low as 0.8 % and device lifetimes (LT60) of 1210 h at 1000 cd m−2.


Abstract

Acceleration of singlet-triplet intersystem crossings (ISC) is instrumental in bolstering triplet exciton harvesting of multi-resonance thermally activated delayed fluorescent (MR-TADF) emitters. This work describes a simple gold(I) coordination strategy to enhance the spin-orbit coupling of green and blue BN(O)-based MR-TADF emitters, which results in a notable increase in rate constants of the spectroscopically observed ISC process to 3×109 s−1 with nearly unitary ISC quantum yields. Accordingly, the resultant thermally-stable AuI emitters attained large values of delayed fluorescence radiative rate constant up to 1.3×105/1.7×105 s−1 in THF/PMMA film while preserving narrowband emissions (FWHM=30–37 nm) and high emission quantum yields (ca. 0.9). The vapor-deposited ultrapure-green OLEDs fabricated with these AuI emitters delivered high luminance of up to 2.53×105 cd m−2 as well as external quantum efficiencies of up to 30.3 % with roll-offs as low as 0.8 % and long device lifetimes (LT60) of 1210 h at 1000 cd m−2.

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