A Mechanochemically Synthesized Hybrid Bismuth Halide as Highly Efficient Red Phosphor for Blue Chip‐Based WLED

Author:

Zhuang Tinghui12,Lin Yanpeng2,Jin Jiance1,Deng Zhonghua1,Peng Yingchen1,Gong Liaokuo3,Wang Zeping1,Du Kezhao2,Huang Xiaoying1ORCID

Affiliation:

1. State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of Matter The Chinese Academy of Sciences Fuzhou Fujian 350002 P. R. China

2. College of Chemistry and Materials Science Fujian Provincial Key Laboratory of Polymer Materials Fujian Normal University 32 Shangsan Road Fuzhou 350007 P. R. China

3. School of Resources and Chemical Engineering Sanming University Sanming 365004 P. R. China

Abstract

AbstractIn recent decades, white light‐emitting diodes (WLEDs) assembled by blue light‐emitting diodes (LEDs) and down‐conversion phosphors have gained rapid development. Thereinto, red phosphors, especially for the ecofriendly and cost‐effective ones, serve an important role for the preparation of superior WLEDs. Herein, a halide compound with a 0D crystal structure, namely [PPh4]2[Bi2Br8(bp4do)(DMSO)2] (BiBrON, PPh4 = tetraphenylphosphonium, bp4do = 4,4′‐bipyridine 1,1′‐dioxide, DMSO = dimethyl sulfoxide) is synthesized at gram scale via a mechanochemical synthesis method. Photophysical properties of BiBrON are investigated in detail. BiBrON has the highest efficiency (78.20%) of red phosphorescence among the Bi‐based halides. The red emission of BiBrON is blue‐light‐excitable with 99.9% color purity and outstanding thermal stability below 400 K. The optical absorption‐emission mechanism in BiBrON is elucidated by the combination study of experiments and density functional theory calculations. BiBrON can be applied as a red phosphor in the blue LED chip‐based WLED with high color rendering index of 87.8, that is higher than the one fabricated utilizing commercial red phosphor (610 nm), and ideal Commission International de l'Eclairage chromaticity coordinate of (0.3282, 0.3311). This work demonstrates for the first time the great potential of Bi‐inorganic–organic hybrid material as phosphors applied for WLED.

Publisher

Wiley

Subject

Atomic and Molecular Physics, and Optics,Electronic, Optical and Magnetic Materials

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