Thermally activated delayed fluorescence emitters showing wide-range near-infrared piezochromism and their use in deep-red OLEDs.

ABSTRACT: Organic small molecules exhibiting both thermally activated delayed fluorescence (TADF) and wide-ranging piezochromism (Δλ > 150 nm) in the near-infrared region have rarely been reported in the literature. We present three emitters MeTPA-BQ, tBuTPA-BQ and TPPA-BQ based on a hybrid acceptor, benzo[g]quinoxaline-5,10-dione, that emit via TADF, having photoluminescence quantum yields, Φ_PL, of 39-42% at photoluminescence (PL) maxima, λ_PL, of 625-670 nm in 2 wt% doped films in 4,4'-bis(N-carbazolyl)-1,1'-biphenyl (CBP). Despite their similar chemical structures, the PL properties in the crystalline states of MeTPA-BQ (λ_em = 735 nm, Φ_PL = 2%) and tBuTPA-BQ (λ_em = 657 nm, Φ_PL

SUBMITTER: Sudhakar P 

PROVIDER: S-EPMC10763033 | biostudies-literature | 2024 Jan

REPOSITORIES: biostudies-literature