The Non-Concentration-Quenching Phosphor Ca3Eu2B4O12 for WLED Application

Gui-Hua Li; Nian Yang; Jing Zhang; Jia-Yong Si; Zheng-Liang Wang; Ge-Mei Cai; Xiao-Jun Wang

doi:10.1021/acs.inorgchem.9b03565

The Non-Concentration-Quenching Phosphor Ca₃Eu₂B₄O₁₂ for WLED Application

Inorg Chem. 2020 Mar 16;59(6):3894-3904. doi: 10.1021/acs.inorgchem.9b03565. Epub 2020 Mar 2.

Authors

Gui-Hua Li¹, Nian Yang¹, Jing Zhang^{1

2}, Jia-Yong Si³, Zheng-Liang Wang⁴, Ge-Mei Cai¹, Xiao-Jun Wang⁵

Affiliations

¹ School of Materials Science and Engineering, Education Ministry Key Laboratory of Non-ferrous Materials Science and Engineering, Central South University, Changsha 410083, People's Republic of China.
² School of Materials Science and Engineering, Southwest Petroleum University, Chengdu, Sichuan 610500, People's Republic of China.
³ College of Mechanical & Electrical Engineering, Central South University of Forestry & Technology, Changsha 410004, People's Republic of China.
⁴ Key Laboratory of Green-Chemistry Materials in University of Yunnan Province, School of Chemistry & Environment, Yunnan Minzu University, Kunming, 650500, People's Republic of China.
⁵ Department of Physics, Georgia Southern University, Statesboro, Georgia 30460, United States.

PMID: 32119529
DOI: 10.1021/acs.inorgchem.9b03565

Abstract

Commercial white LED devices usually suffer from a high color temperature and poor color rendering. Developing a new, efficient, and stable red phosphor is the key to solving this problem. In this work, a series of pure Ca₃Y_2-xB₄O₁₂:xEu³⁺ (0 < x ≤ 2) samples, including the new and fully transitional borate phosphor Ca₃Eu₂B₄O₁₂ (CEBO), have been successfully prepared by solid-state reaction synthesis. CEBO is isostructural with Ca₃Y₂B₄O₁₂ (CYBO), belonging to the orthorhombic system with space group Pnma (No. 62). Under optimal 393 nm excitation, this borate exhibits a strong red emission, peaking at 615 nm, with high color purity. Interestingly, the luminescence of CEBO is relatively higher than that of CYBO:Eu³⁺ phosphors. The quantum yield of this non-concentration-quenching phosphor reaches 95.6%. Furthermore, a warm pc-WLED device has been fabricated by mixing as-prepared CEBO powders and commercial BaMgAl₁₀O₁₇:Eu²⁺ and (Sr, Ba)₂SiO₄:Eu²⁺ phosphors, which exhibits a high color rendering index (Ra = 83.7) along with a color temperature of around 3883 K. The present work indicates that this new borate, with outstanding quantum efficiency and favorable thermal stability, can be used as a red phosphor for application in WLEDs.