Anionic Regulation toward Bi3+ Selective Occupation for Full-Spectrum White Light Emission

Sheng Wu; Puxian Xiong; Dongliang Jiang; Quan Liu; Ke Zhang; Binli Xiao; Yan Chen; Yinzhen Wang

doi:10.1021/acs.inorgchem.2c04243

Anionic Regulation toward Bi³⁺ Selective Occupation for Full-Spectrum White Light Emission

Inorg Chem. 2023 Mar 27;62(12):4894-4902. doi: 10.1021/acs.inorgchem.2c04243. Epub 2023 Mar 14.

Authors

Sheng Wu¹, Puxian Xiong², Dongliang Jiang³, Quan Liu³, Ke Zhang², Binli Xiao¹, Yan Chen³, Yinzhen Wang¹

Affiliations

¹ School of Physics and Telecommunication Engineering, Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, Guangdong Engineering Technology Research Center of Efficient Green Energy and Environmental Protection Materials, Guangdong-Hong Kong Joint Laboratory of Quantum Matter, South China Normal University, Guangzhou 510006, China.
² School of Physics and Optoelectronics, School of Materials Science and Engineering, Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques, Guangdong Engineering Technology Research and Development Center of Special Optical Fiber Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou 510640, China.
³ School of Applied Physics and Materials, Wuyi University, Jiangmen, 529000, China.

PMID: 36917791
DOI: 10.1021/acs.inorgchem.2c04243

Abstract

An activator's selective occupation of a host is of great significance for designing high-quality white light-emitting diode phosphors, while achieving a full-spectrum single-phase white light emission phosphor is challenging. In this study, a boron phosphate solid-solution Na₂Y₂(BO₃)_2-x(PO₄)_xO:0.005 Bi³⁺ (NYB_2-xP_xO:0.005 Bi³⁺) white phosphor was designed by selectively occupying Bi³⁺ activators in the mixed anionic groups. The substitutes of the anionic unit (BO₃)^3- by the (PO₄)^3- unit are supposed to force part of the Bi³⁺ ion to enter the Na lattice site, which produces an intense orange-red emission peaked at 590 nm. In parallel, spectral tuning from blue to white light and an internal quantum efficiency of 56.42% was obtained, and the thermal stabile luminescence intensity remains at 94.2% of the initial intensity after four heating-cooling cycles from 30 to 210 °C (luminescent intensity is 83.6% of room temperature (RT) at 150 °C, with excellent thermal stability and recovery performance). Finally, an excellent color rendering index (Ra = 90.8 and R9 = 85) was demonstrated for white light-emitting diode devices using only an NYB_1.5P_0.5O:0.005 Bi³⁺ phosphor and a near-ultraviolet (n-UV) 365 nm LED chip. This work delves into the different selective occupancy of Bi³⁺ ions and explores a new avenue for the design of phosphors for full-spectrum white light emission.