Enhancing Electroluminescence Performance of Ultra-Deep-Blue Through-Space Charge Transfer Emitters with CIEy ≈ 0.05 Via Methyl-modification

A methyl-modification strategy is proposed to enhance the ICT and RISC processes of ultra-deep-blue through-space charge transfer emitters. The prepared emitter 3MeCz-BO achieves a high EQE max of 10.1% with CIE coordinates of (0.151, 0.051).