Circularly Polarized Electroluminescence of Thermally Activated Delayed Fluorescence-Active Chiral Binaphthyl-Based Luminogens

• DOI: 10.1021/acsami.9b07005
• Publication Date: 2019-06-26T12:14:37Z
• Authors: Yuxiang Wang; Yu Zhang; Wenrui Hu; Yiwu Quan; Yunzhi Li; Yixiang Cheng
• Keywords: Quantum yield; Quantum Efficiency

Two pairs of thermally activated delayed fluorescence (TADF)-active chiral luminogens (R/S-1 and R/S-2) can be achieved by introducing D-A-type groups to BINOL skeletons. The resulting exhibit aggregation-induced emission properties in THF-water mixtures TADF a doped-film state. absolute photoluminescence quantum yield (ΦPL) lifetimes (τdelayed) were measured 18.5% 1.03 μs for R-1 15.7% 0.97 R-2. However, only R/S-1 with the fixed conjugation structure emit circularly polarized luminescence signals, glum reach 1.6 × 10-3 toluene solution 9.2 10-4 neat film. Most importantly, was chosen as emitting layers orange-red organic light-emitting diodes, which display low turn-on voltage (Von) 3.4 V, high maximum brightness (Lmax) up 40 470 cd m-2, moderate external efficiency 4.1%, well electroluminescence signal gEL = -0.9 10-3/+1.0 10-3.