White light illumination and temperature sensing characteristics of Dy3+-doped Ca7NaY(PO4)6 single-matrix phosphor

ZHAO Jin; TU Ruting; LIU Funi; LU Jingwen; FU Yongcheng; WANG Yu; LI Tingzheng; LENG Zhihua

doi:10.7498/aps.74.20250886

Abstract

Rare earth-activated phosphors have shown great potential applications in various fields, such as lighting, displays, anti-counterfeiting, and optical thermometry. This study aims to synthesize a series of Dy³⁺-doped Ca₇NaY(PO₄)₆ phosphors through high-temperature solid-state reaction, focusing on developing multifunctional optical materials for lighting and temperature sensing. The phase purity and morphological characteristics of the obtained samples are confirmed by X-ray diffraction and scanning electron microscopy. Luminescence properties and energy transfer mechanisms are systematically investigated through photoluminescence spectroscopy and fluorescence decay analysis. Under 350-nm near-ultraviolet excitation, the emission intensity of Ca₇NaY(PO₄)₆: Dy³⁺ increases with Dy³⁺ concentration rising until reaching an optimal value at x = 0.07, beyond which concentration quenching occurs. This quenching behavior is attributed to enhanced non-radiative energy transfer at higher Dy³⁺ concentrations, leading to a corresponding decrease in fluorescence lifetime. The optimized Ca₇NaY(PO₄)₆: 0.07Dy³⁺ phosphor displays remarkable thermal stability, retaining 87.6% of its initial emission intensity at 150 ℃. The white light emitting diode(LED) device fabricated using the obtained phosphor and near-UV LED chip shows excellent performance with a correlated color temperature of 5680 K, CIE coordinates of (0.3275, 0.3883) in the white light region and a color rendering index of 85. Furthermore, temperature-dependent fluorescence intensity ratio analysis reveals excellent optical thermometric performance, achieving a maximum relative sensitivity (S_r) of 1.72 %/K. These results indicate that the Ca₇NaY(PO₄)₆:Dy³⁺ phosphor exhibits significant potential applications in single-matrix phosphor-converted white LEDs and high-precision optical optical thermometry.

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Corresponding author: ZHAO Jin, zhaojin@xauat.edu.cn

Funds: Project supported by the National Natural Science Foundation of China (Grant No. 11804265), the Key Science and Technology Innovation Team of Shaanxi Province, China (Grant No. 2022TD-30), and the Natural Science Basic Research Program of Shaanxi Province, China (Grant No. 2024JC-YBMS-384).

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No.	Concentration	x	y	CCT/K
1	0.01	0.3897	0.4375	4219
2	0.03	0.3846	0.4457	4130
3	0.05	0.3894	0.4510	4033
4	0.07	0.3905	0.4529	4015
5	0.09	0.3872	0.4483	4075
6	0.11	0.3865	0.4482	4093

DownLoad: CSV

Sensing materials	Temperature range/K	S_r _max/ (%·K^–1)	Ref.
Ca₇NaY(PO₄)₆: Dy³⁺	298—448	1.72	This work
Ca₅(PO₄)₂SiO₄: Dy³⁺	296—1073	1.75	[2]
KNaCa₂(PO₄)₂: Dy³⁺	90—230/ 250—500	2.57/ 0.74	[16]
CaLa₄(SiO₄)₃O: Dy³⁺	298—548	1.67	[23]
Sr₃Ga₂Ge₄O₁₄:Dy³⁺	298—473	0.61	[32]
GdPO₄: Dy³⁺	290—530	1.55	[44]
Ca₃LuAl₃B₄O₁₅: Dy³⁺	300—500	1.46	[45]

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Vol. 74, Issue 20 - 2025-10-20

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