Space-Isolated Chromophore for Organic Blue Phosphorescence with High Efficiency and a Deep-Blue Lasing Characteristic.

High-efficiency blue phosphorescence and deep-blue laser emissions play a crucial role in organic optoelectronic applications. However, designing metal-free organic blue luminescence with high energy levels of excited states and suppression of nonradiative transitions remains a formidable challenge. Herein, we demonstrate a synthetic strategy for achieving a deep-blue laser and efficient phosphorescence based on confining chromophores in the tetrahedral structure of sp3 hybridization.