Bibliographic Details
| Title: |
Concentration- and temperature- dependent luminescence quenching and optical transition of Sr2GdTaO6: Eu3+ phosphor for potential applications in white LEDs |
| Authors: |
Li Wang, Yuhang Zhang, Duan Gao, Xuezhu Sha, Xin Chen, Yanqiu Zhang, Jinsu Zhang, Xizhen Zhang, Yongze Cao, Yichao Wang, Xiangping Li, Sai Xu, Hongquan Yu, Baojiu Chen |
| Source: |
Results in Physics, Vol 56, Iss , Pp 107238- (2024) |
| Publisher Information: |
Elsevier, 2024. |
| Publication Year: |
2024 |
| Collection: |
LCC:Physics |
| Subject Terms: |
Sr2GdTaO6, Eu3+, Concentration quenching, Thermal quenching, Judd-Ofelt analysis, Physics, QC1-999 |
| More Details: |
A series of Eu3+ doped Sr2GdTaO6 (SGT) phosphors with double perovskite structure were synthesized via a high-temperature solid-state reaction approach. The crystal structure, morphology and luminescence properties were characterized by means of X-ray diffraction, transmission electron microscope, luminescence spectroscopy and fluorescence decay lifetimes, respectively. Under the excitation of 394 nm, intense red emission in the visible region was observed in Eu3+ doped SGT phosphors, and the critical quenching concentration of Eu3+ in SGT phosphors was derived to be 15 mol%. The chromaticity coordinates and color purity of SGT: 15 mol% Eu3+ were calculated to be (0.61, 0.36) an 93.82 %, respectively. Meanwhile, it was also confirmed that the electric quadrupole–quadrupole interaction is responsible for the luminescence concentration quenching of Eu3+. The internal quantum efficiency of SGT: Eu3+ phosphors with different Eu3+ concentrations were calculated. Furthermore, the crossover process was confirmed to be the main mechanism for luminescence thermal quenching based on the temperature-dependent emission spectra and temperature-dependent fluorescence lifetimes. In addition, the Judd-Ofelt parameters, radiative transition rates and branch ratios from the 5D0 emitting states to various lower energy states were evaluated with the aid of the Judd-Ofelt theory, respectively. All results indicate that SGT: Eu3+ samples are a promising red-emitting phosphor. |
| Document Type: |
article |
| File Description: |
electronic resource |
| Language: |
English |
| ISSN: |
2211-3797 |
| Relation: |
http://www.sciencedirect.com/science/article/pii/S2211379723010318; https://doaj.org/toc/2211-3797 |
| DOI: |
10.1016/j.rinp.2023.107238 |
| Access URL: |
https://doaj.org/article/8a261c3d1a274a62b32a4f230f179d8c |
| Accession Number: |
edsdoj.8a261c3d1a274a62b32a4f230f179d8c |
| Database: |
Directory of Open Access Journals |
