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- Title
Crystal structure and luminescence characterizations of Eu<sup>3+</sup>-doped Sr<sub>2</sub>GaTaO<sub>6</sub> phosphors with high color purity for w-LEDs.
- Authors
Ji, Changjian; Zhang, Hailong; Wang, Wenjing; Yuan, Huimin; Zhao, Gang
- Abstract
In order to acquire a red light-emitting component for an efficient w-LEDs device, we synthesized a series of Eu3+-doped Sr2GaTaO6 (SGT) phosphors using a traditional high-temperature solid-phase technique. The results of UV diffuse reflectance proved that the SGT host possesses a broad optical energy bandgap (Egap) of 4.47 eV (calculated value). The relevant characteristic spectra were also tested. By monitoring the emission at 612 nm, the excitation peak at 466 nm matches the blue light region (460–470 nm) of the popular blue LED chips on the market. The photoluminescence (PL) spectra of SGT: Eu3+ phosphors at room temperature consisting of four obvious PL bands (5D0 → 7F1, 5D0 → 7F2, 5D0 → 7F3, and 5D0 → 7F4) in the visible range. And the PL properties are necessarily analyzed by fluorescence decay curves. And it exhibits a decent photoluminescence quantum yield (39.88%). Moreover, the color purity and the ∆E of the SGT: 0.2Eu3+ sample are 96.5% and 0.29 eV, respectively, demonstrating that the ∆E of SGT: Eu3+ phosphor is superior to other reported Eu3+-doped materials for w-LEDs applications. The results manifest that the Eu3+ doped SGT phosphors can be outstanding candidates for w-LEDs applications with high color purity and activation energy.
- Publication
Journal of Materials Science: Materials in Electronics, 2023, Vol 34, Issue 20, p1
- ISSN
0957-4522
- Publication type
Article
- DOI
10.1007/s10854-023-10934-5