Bi³⁺ Full Occupancy Efficient Ultra-Wideband Emission Based on Triangle Pore Structure

Abstract

Ultrawideband emitting phosphors have shown remarkable application value in the photoelectric field. However, achieving ultrawideband emission covering the visible spectrum with the single activator is rare for metal oxide perovskites. Herein, we report a series of Bi 3+ -activated Sr 3−x Ba x BiY 3 B 4 O 15 (x = 0.0, 1.0, and 2.0) phosphors with ultrabroadband emission covering the visible spectrum. The unique triangular pore structure in the matrix maintains the maximum Bi 3+ −Bi 3+ spacing, effectively suppressing the concentration quenching of luminescence caused by the cascade energy transfer between the Bi 3+ 's. The Bi 3+ achieves full site occupation in the crystal and produces ultrabroadband emission from 400 to 830 nm through Bi−Y metal−metal charge transfer (Bi−Y-MMCT) transitions with a photoluminescence quantum yield (PLQY) of up to 98.1%. A single-phase white light SrBa 2 BiY 3 B 4 O 15 phosphor with low blue light content and a broadband component exhibits a PLQY of up to 93.2%. This work can initiate the exploration of optimizing concentration quenching and inorganic ultrawideband emission materials.