In this study, a series of Ce3+, Eu2+, and Ce3+/Eu2+ co-doped oxyapatite Ba2La3(SiO4)2(PO4)O (BLSPO) phosphors were synthesized by the high-temperature solid-phase method. The crystal structure, luminescent properties and application prospects of the material were systematically studied. BLSPO crystallizes in the P63/m space group (No. 176), exhibiting experimentally confirmed high crystallinity. Photoluminescence and excitation spectroscopy analysis indicated that the BLSPO: Eu2+ phosphor could be effectively excited at 370 nm and was highly suitable for use in LED chips. The emission spectrum of BLSPO: Eu2+ phosphor shows a broadband emission peak of Eu2+ ions, with the peak at 510 nm. Through Gaussian fitting, this peak can be further fitted to two different emission centers at 507 nm and 536 nm, corresponding respectively to the M(I) and M(II) coordination environments within the BLSPO matrix. Under 315 nm excitation, the BLSPO:xCe3+ phosphor demonstrates a broad emission band peaking around 428 nm, with experimental results identifying 10 mol% as the optimal cerium ion doping concentration for maximal performance. In the BLSPO: Ce3+, Eu2+ co-doped system, the energy transfer mechanism between Ce3+ and Eu2+ was studied, and the energy transfer efficiency η value gradually increased from 0% to 86.96% with the increase of Eu2+ concentration. The mechanism of energy transfer is dipole-dipole interaction mechanisms. The thermal stability of the BLSPO:10 mol%Ce3+, 10 mol%Eu2+ samples was tested, and the sensitivity factors Sa and Sr reached their respective maximum values of 2.61 × 10− 2 K− 1 and 0.99% K− 1 at 480 K. The thermal stability test of BLSPO:5 mol%Eu2+ shows that at 420 K, the sample maintains 52% of its initial luminous intensity. Therefore, the CIE chromaticity coordinates of the green LED packaged with BLSPO:10 mol% Eu2+ phosphor is (0.263, 0.466), the CIE chromaticity coordinates of the w-LED are (0.335, 0.355), the color rendering index (Ra) is 92, and the correlated color temperature (CCT) is 5366 K.

Eu²⁺ and Ce³⁺/Eu²⁺ co-doped Ba₂La₃(SiO₄)₂(PO₄)O Phosphors: Luminescence Properties and Applications in LEDs and Temperature Sensing

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发表日期：

2025年12月20日

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Shili Liu,
Xuemei Yao,
Xinyue Zhang,
Kai Sheng,
Chenyi Wang,
Tong Zhu,
Ruijin Yu,
Guoxiu Xing

摘要

In this study, a series of Ce³⁺, Eu²⁺, and Ce³⁺/Eu²⁺ co-doped oxyapatite Ba₂La₃(SiO₄)₂(PO₄)O (BLSPO) phosphors were synthesized by the high-temperature solid-phase method. The crystal structure, luminescent properties and application prospects of the material were systematically studied. BLSPO crystallizes in the P6₃/m space group (No. 176), exhibiting experimentally confirmed high crystallinity. Photoluminescence and excitation spectroscopy analysis indicated that the BLSPO: Eu²⁺ phosphor could be effectively excited at 370 nm and was highly suitable for use in LED chips. The emission spectrum of BLSPO: Eu²⁺ phosphor shows a broadband emission peak of Eu²⁺ ions, with the peak at 510 nm. Through Gaussian fitting, this peak can be further fitted to two different emission centers at 507 nm and 536 nm, corresponding respectively to the M(I) and M(II) coordination environments within the BLSPO matrix. Under 315 nm excitation, the BLSPO:xCe³⁺ phosphor demonstrates a broad emission band peaking around 428 nm, with experimental results identifying 10 mol% as the optimal cerium ion doping concentration for maximal performance. In the BLSPO: Ce³⁺, Eu²⁺ co-doped system, the energy transfer mechanism between Ce³⁺ and Eu²⁺ was studied, and the energy transfer efficiency η value gradually increased from 0% to 86.96% with the increase of Eu²⁺ concentration. The mechanism of energy transfer is dipole-dipole interaction mechanisms. The thermal stability of the BLSPO:10 mol%Ce³⁺, 10 mol%Eu²⁺ samples was tested, and the sensitivity factors S_a and S_r reached their respective maximum values of 2.61 × 10^− 2 K^− 1 and 0.99% K^− 1 at 480 K. The thermal stability test of BLSPO:5 mol%Eu²⁺ shows that at 420 K, the sample maintains 52% of its initial luminous intensity. Therefore, the CIE chromaticity coordinates of the green LED packaged with BLSPO:10 mol% Eu²⁺ phosphor is (0.263, 0.466), the CIE chromaticity coordinates of the w-LED are (0.335, 0.355), the color rendering index (R_a) is 92, and the correlated color temperature (CCT) is 5366 K.

Eu2+ and Ce3+/Eu2+ co-doped Ba2La3(SiO4)2(PO4)O Phosphors: Luminescence Properties and Applications in LEDs and Temperature Sensing

摘要

Eu²⁺ and Ce³⁺/Eu²⁺ co-doped Ba₂La₃(SiO₄)₂(PO₄)O Phosphors: Luminescence Properties and Applications in LEDs and Temperature Sensing