Preparation and luminescence properties of Tb3+ doped and Tb3+/Sm3+ co-doped Na3Y(PO4)2 crystalline glass ceramics

• Published in: Materials science & engineering. B, Solid-state materials for advanced technology Vol. 272; p. 115352
• Main Authors: Guo, Zhaohua, Wang, Liying, Lv, Huimin, Shao, Jing, Zhang, Hongbo, Wang, Siying, Wang, Tong, Su, Chunhui
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 01.10.2021; Elsevier BV
• Subjects: Crystal structure; Crystallinity; Crystallization; Doping; Emission; Energy transfer; Fluorescence; Glass ceramics; Heat treatment; Light emitting diodes; Luminescence; Na3Y(PO4)2; Optical properties; Sm2O3-Tb4O7 co-doped; Tb4O7 doped; White light; Tb4O7 doped; Sm2O3-Tb4O7 co-doped; Glass ceramics; Na3Y(PO4)2; Luminescence
• ISSN: 0921-5107; 1873-4944
• DOI: 10.1016/j.mseb.2021.115352

The picture shows the emission spectra of y Sm2O3-0.5% Tb4O7 doped glass ceramics (GCs) excited at 378 nm. It can be observed that under the excitation of 378 nm, at 416 nm, 437 nm, 489 nm, 545 nm and 585 nm, respectively, the transitions of Tb3+ correspond to 5D3 → 7F4, 5D3 → 7F5, 5D4 → 7F6, 5D4 → 7F5, 5D4 → 7F5, 5D4 → 7F5, 5D4 → 7F4. At 564 nm, 600 nm and 648 nm corresponding to the characteristic transitions of Sm3+ from 4G5/2 to 6H5/2, 6H7/2 and 6H9/2, respectively. It can be seen that as the doping concentration of Sm2O3 increases, the characteristic emission of Tb3+ gradually decreases at 545 nm (5D4 → 7F5), while the emission intensities of Sm3+ at 564 nm (4G5/2 → 6H5/2), 600 nm (4G5/2 → 6H7/2) and 648 nm (4G5/2 → 6H9/2) were significantly enhanced. The emission intensity of ySm2O3-0.5% Tb4O7 doped GCs first increases and then decreases with the increase of Sm2O3 doping concentration.This phenomenon may be indicate that there has energy transfer from Tb3+ to Sm3+ in Sm2O3-Tb4O7 doped GCs. [Display omitted] •Glass ceramics containing Na3Y(PO4)2 crystal phase were prepared.•The optimal doping concentrations of Tb4O7 and Sm2O3 were 0.5% and 1.0%.•The energy transfer mechanism from Tb3+ to Sm3+ is dipole–dipole interaction. Tb4O7 doped and Sm2O3-Tb4O7 co-doped containing Na3Y(PO4)2 crystalline glass ceramics were prepared by melting crystallization,which heat treatment condition was 660 ℃/120 min. In the emission spectrum, there are characteristic peaks of Tb3+ at 416 nm, 437 nm, 489 nm, 545 nm, 585 nm, and 621 nm. In addition, the emission intensity at 545 nm is the strongest corresponding to the 5D4→7F5 transition of Tb3+. And the optimal doping concentration of Tb4O7 doped glass ceramics is 0.5%. Sm2O3-Tb4O7 co-doped glass ceramics were excited at 378 nm, and the characteristic emission of Tb3+ and Sm3+ could be obtained in the same spectrum. The energy transfer of Tb3+ to Sm3+ was proved by fluorescence lifetime and Dexter theory. Sm2O3-Tb4O7 co-doped Na3Y(PO4)2 crystal phase glass ceramics can be used in green lasers and White light-emitting diode (w-LEDs) by adjusting the doping concentration of Sm2O3 and Tb4O7.