White light emission and superior color stability in a single-component host with exceptional eminent color rendering and theoretical calculations on Duv for color quality†

Abstract

Correlated color temperature (CCT) is widely used to describe the chromaticity of white light sources, although chromaticity is only two-dimensional, and the distance from the Planckian locus is typically absent. Herein, a novel single-phase Ca₃YAl₃B₄O₁₅:Tm³⁺,Dy³⁺,Eu³⁺, an emerging white-emitting phosphor with good optical properties and thermal-stability, is produced, and the practical calculation methods to calculate the chromaticity-shift (ΔE) and D_uv value for color-quality are also demonstrated, making it a good contender for possible use in LEDs. The incorporation of Eu³⁺ into Ca₃YAl₃B₄O₁₅:0.015Tm³⁺,0.08Dy³⁺ resulted in attractive warm-white light with CCT declining from 4635 K to 3065 K. The Ca₃YAl₃B₄O₁₅:Tm³⁺,Dy³⁺,Eu³⁺ exhibited excellent thermal stability (I@400 K = ∼93%). The Ca₃YAl₃B₄O₁₅:Tm³⁺,Dy³⁺,Eu³⁺-based WLED exhibits satisfactory parameters of high R_a (89.9) and low-CCT (3065 K). Additionally, this article offers useful mathematical strategies for calculating D_uv over a wide-range of chromaticity, from 2000 to 6000 K in CCT and from −0.002 to 0.014, which strongly matches the range in an American National Standards Institute (ANSI) standard. For the first time, white light with minimized thermal-quenching, improved CRI, and color quality has been used in near-UV chip-excited WLEDs.