Preparation of zero-thermal-quenching tunable emission bismuth-containing phosphors through the topochemical design of ligand configuration. Issue 17 (30th July 2021)

• Record Type: Journal Article
• Authors: Ma, Qincan; Guo, Ning; Xin, Yanmei; Shao, Baiqi
• Is Part Of: Inorganic chemistry frontiers. Volume 8:Issue 17(2021)
• Page Start: 4072
• Page End: 4085
• Publication Date: 2021-07-30
• Subjects: Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/d1qi00705j
• Languages: English
• ISSNs: 2052-1553

Abstract

Abstract : We report a high performance bismuth-containing phosphor with zero-thermal-quenching, which can be used for white light illumination and non-contact temperature sensing. Abstract : Bismuth-doped luminescent materials have obtained widespread attention for solid state lighting and optical sensing due to their excellent luminescence properties and preparation in a non-reducing green environment. However, the luminescence tuning of Bi 3+ is a huge challenge, restricting its application. In this work, we regulate the emission of Bi 3+ through the topochemical design of the ligand configuration and means of excitation-driven. When the ratio of Nb 5+ /Ta 5+ in the host is changed, the dissymmetry in the lattice configuration of the two cations (Nb 5+ /Ta 5+ ) makes the crystal electron cloud expand, and the nephelauxetic effect increases the bond length between the activator (Bi 3+ ) and ligand (O 2− ) in the host, thereby reducing the field splitting energy of Bi 3+, and the blue shift of Bi 3+ emission is realized. When Bi 3+ replaces Y 3+, Bi 3+ and O 2− form an irregular twisted octahedron, and each Bi 3+ with a different lattice configuration is a luminescent site. The emission peak of Bi 3+ can be red-shifted from 419 nm to 473 nm and is excitation-driven. On the basis of the tunable luminescence characteristics of the phosphor, a white-emitting single-phase phosphor (YNb0.2 Ta0.8 O4 :Bi 3+, Eu 3+ ) with adjustable corrected color temperature (CCT) was prepared by building Bi 3+ -Eu 3+ energy transfer. Even more surprising is that Eu 3+ appears at zero thermal-quenching, and the emission intensity increases with increasing temperature. The emission intensity of Bi 3+ can reach 62.3% at 423 K, and the phosphor can still emit warm-white light at a high temperature of 443 K. Furthermore, on the basis of the unique zero thermal quenching characteristics of Eu 3+, a non-contact optical temperature sensing phosphor (YNb0.8 Ta0.2 O4 :Bi 3+, Eu 3+ ) was prepared. The material shows good temperature measurement performance in the temperature range of 303–523 K, and the relative sensitivity Sr reaches 1.80% K −1 . This topochemical design of ligand configuration provides a new perspective for the development of high-performance phosphors with tunable emission.