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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 Ca1.9 − xLa8(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 Ca1.9 − xLa8(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 Ca1.9 − xLa8(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 Ca1.9 − xLa8(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)

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