Luminescence and Thermal-Quenching Properties of Red-Emitting Ca2Al2SiO7:Sm3+ Phosphors

• Published in: Journal of electronic materials Vol. 49; no. 6; pp. 3701 - 3707
• Main Authors: Son, Nguyen Manh, Tien, Do Thanh, Lien, Nguyen Thi Quynh, Quang, Vu Xuan, Trac, Nguyen Ngoc, Hong, Tran Thi, Tuyen, Ho Van
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.06.2020; Springer Nature B.V
• Subjects: Characterization and Evaluation of Materials; Chemistry and Materials Science; Chromaticity; Dipole interactions; Electronics and Microelectronics; Instrumentation; Luminescence; Luminescence quenching; Materials Science; Optical and Electronic Materials; Phosphors; Photoluminescence; Quenching; Raman spectra; Solid State Physics; Temperature dependence; Thermal stability; Unit cell; SiO; concentration quenching; samarium; Al; luminescent materials; Ca
• ISSN: 0361-5235; 1543-186X
• DOI: 10.1007/s11664-020-08086-x

Ca 2 Al 2 SiO 7 : x .Sm 3+ ( x  = 0.5, 1.0, 1.5, 2.0, 2.5, and 3.5 mol.%) (CAS: x .Sm 3+ ) phosphors were synthesized by a solid-state reaction technique. The structure, photoluminescence properties and thermal stability of phosphors were investigated in detail. Results of X-ray diffraction show that CAS: x .Sm 3+ materials have a single-phased tetragonal structure, and an expansion of the unit cell relates to the increasing of Sm 3+ concentration. Photoluminescence study displayed that the CAS: x .Sm 3+ phosphors reach the highest emission intensity at 1.5 mol.% Sm 3+ and achieved the luminescence quenching phenomenon a higher concentration. The dominant interaction mechanism of the concentration quenching process is determined due to the dipole–dipole interaction, and the critical transfer distance ( R c ) is 26.7 Å. The temperature dependence of photoluminescence spectra indicates that the Ca 2 Al 2 SiO 7 :Sm 3+ (1.5 mol.%) phosphor possess good thermal stability, and that the activation energy is around 0.12 eV (968 cm −1 ). Several characteristic vibrations in the 200–1000-cm −1 region were observed by Raman spectra, and the color chromaticity coordinates of the samples were also calculated and discussed.