ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Modulating the emission spectrum of Ca₂La₈(SiO₄)₆O₂:Eu^(2+,3+) phosphor through Mn²⁺ ion doping

Fei Wang, Huihui Chen, Shiwei Zhang, and Huiqing Jin

Key Laboratory of Traffic Information and Safety of Anhui Higher Education Institutes, Anhui Sanlian University, Hefei, People’s Republic of China

E-mail: wangfchina@163.com

Received: 12 January 2022  Accepted: 4 May 2022

Abstract:

A series of Ca_{1.9 − x}La₈(SiO₄)₆O₂:0.1Eu^(2+,3+), xMn²⁺ (0 ≤ x ≤ 0.10) phosphors were successfully prepared by high-temperature solid-phase method, and the effect of Mn²⁺ doping on the crystal structure and luminescence properties of phosphor Ca₂La₈(SiO₄)₆O₂:Eu^(2+,3+) was systematically studied. The series of samples are oxyapatite structure, belonging to hexagonal system, and the space group is P6₃/m(176) or P-3. The excitation spectrum of Ca_{1.9 − x}La₈(SiO₄)₆O₂:0.1Eu^(2+,3+), xMn²⁺ ranges from 200 to 450 nm. It is composed of a broadband spectrum formed by the charge transition of Eu³⁺ and Eu²⁺, and a sharp line spectrum formed by the ⁷F₀ electronic transition of Eu³⁺. The emission spectrum of Ca_{1.9 − x}La₈(SiO₄)₆O₂:0.1Eu^(2+,3+), xMn²⁺ ranges from 550 to 750 nm. When the concentration of Mn²⁺ x ≥ 0.04, the emission of ⁵D₁ (538 nm, 556 nm) of Eu³⁺ successfully activates the emission of Mn²⁺ and realizes energy transfer. The valence states of Eu and Mn in the phosphors were analyzed by XPS spectra. The emission light of Ca_{1.9 − x}La₈(SiO₄)₆O₂:0.1Eu^(2+,3+), xMn²⁺ phosphors move from the yellow light area (0.4631, 0.4780)to the orange-red light area (0.5539, 0.3554) by controlling the Mn²⁺ doping, and the color temperature of the samples are all around 2500 K.

Keywords: LEDs; Phosphors; Ca1.9 − xLa8(SiO4)6O2:0.1Eu(2+,3+); xMn2+; Energy transfer; Luminescence properties

Full paper is available at www.springerlink.com.

DOI: 10.1007/s11696-022-02267-0

Chemical Papers 76 (9) 5853–5864 (2022)