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- Title
Spectroscopic investigation of novel yellow-emitting Li<sub>3</sub>Bi<sub>3</sub>Te<sub>2</sub>O<sub>12</sub>:Dy<sup>3+</sup> phosphors with high thermal stability for w-LEDs applications.
- Authors
Cheang, Tuckyun; Zhou, Hongyan; Lin, Weihao; Wang, Yayun; Chang, Xiaonian; Chen, Dan; Zhang, Yongcheng
- Abstract
A series of Li3Bi3Te2O12:xDy3+ (x = 0.01, 0.02, 0.05, 0.10, 0.15, 0.20, and 0.30 mol) samples were successfully prepared by high-temperature sintering method. The phase purities of the Li3Bi3Te2O12:Dy3+ phosphors were verified by powder X-ray diffraction (XRD) and revealed as single-phase structure. Under 386-nm excitation, the Dy3+-doped Li3Bi3Te2O12 phosphors show three emission peaks are located at 488, 579, and 673 nm, which are ascribed to the typical transitions from 4F9/2 to 6HJ/2 (J = 15, 13, and 11), respectively. The effects of concentration on luminescence properties indicate that the optimal doping concentration was x = 0.02 mol. The prepared Li3Bi3Te2O12:0.02Dy3+ phosphor has the excellent thermal stability with high-temperature quenching temperature (T0.5 > 480 K) and high activation energy (Ea = 0.38 eV). The shift of CIE chromaticity coordinates of Li3Bi3Te2O12:0.02Dy3+ phosphor with concentrations are Δx = 0.018 and Δy = 0.020. Thus, Li3Bi3Te2O12:Dy3+ phosphors have potential application for white light-emitting diodes (w-LEDs).
- Subjects
PHOSPHORS; THERMAL stability; X-ray powder diffraction; LIGHT emitting diodes; ACTIVATION energy; GALLIUM antimonide
- Publication
Journal of Materials Science: Materials in Electronics, 2022, Vol 33, Issue 28, p22508
- ISSN
0957-4522
- Publication type
Article
- DOI
10.1007/s10854-022-09030-x