Realizing Color Transitions for Three Copper (I) Cluster Organic‐Inorganic Hybrid Materials by Adjusting Reaction Conditions

Abstract Copper iodide organic‐inorganic hybrid materials have been favored by many researchers in the field of solid‐state lighting (SSL) due to their structural diversity and optical adjustability. In this paper, three isomeric copper iodide cluster hybrid materials, Cu 4 I 6 (L) 2 ( 1 ), Cu 5 I 4.5 Cl 2.5 (L) 2 ( 2 ) and Cu 5 I 7 (L) 2 ) ( 3 ) ( L= 1‐(4‐methylpyrimidin‐2‐yl)‐1,4‐diazabicyclo[2.2.2]octan‐1‐ium), were achieved by adjusting the reaction conditions. The crystal color transit from green, yellow to orange and the internal quantum yield (IQY) increase from 57 %–88 %. All three complexes have good thermal stability, good solution processability, and high quantum yield. And origin and mechanism of luminescence of complexes were further studied. This study can provide ideas and theoretical basis for the regulation of cuprous iodide cluster luminescent materials.