Analysis of the structure and luminescence properties of Zn 2 GeO 4 :Eu 3+ according to Judd-Ofelt theory.

Autor: Lan NMCHP; International Training Institute For Materials Science (ITIMS), Hanoi University of Science and Technology (HUST), No. 01, Dai Co Viet Road, Hanoi, Vietnam., Kien NDT; International Training Institute For Materials Science (ITIMS), Hanoi University of Science and Technology (HUST), No. 01, Dai Co Viet Road, Hanoi, Vietnam., Tuan TQ; International Training Institute For Materials Science (ITIMS), Hanoi University of Science and Technology (HUST), No. 01, Dai Co Viet Road, Hanoi, Vietnam., Viet DX; International Training Institute For Materials Science (ITIMS), Hanoi University of Science and Technology (HUST), No. 01, Dai Co Viet Road, Hanoi, Vietnam., Thang CX; International Training Institute For Materials Science (ITIMS), Hanoi University of Science and Technology (HUST), No. 01, Dai Co Viet Road, Hanoi, Vietnam., Tung NV; Institute of Science and Technology, Ministry of Public Security, No 100, Chien Thang Road, Hanoi, Vietnam., Tam TTH; National economics university (NEU), No 207, Giai Phong Road, Hanoi, VietNam., Giang NT; Department of Chemistry, Faculty of Materials, Ha noi University of Civil Engineering, No 55 Giai Phong Road, Hanoi, VietNam.
Jazyk: angličtina
Zdroj: Luminescence : the journal of biological and chemical luminescence [Luminescence] 2022 Aug; Vol. 37 (8), pp. 1404-1410. Date of Electronic Publication: 2022 Jun 09.
DOI: 10.1002/bio.4299
Abstrakt: The preparation and characteristic of nanorod-like Zn 2 GeO 4 doped with Eu 3+ or zinc germanate (ZGO):xEu 3+ (x = 0 ÷ 0.05), which was synthesized using the hydrothermal method, are described. The influence of Eu 3+ -doping ions on the structure and the optical properties of ZGO was also investigated. According to the photoluminescence spectra, ZGO:xEu 3+ nanophosphors gave a red emission due to the 5 D 0 → 7 F 2 emission of Eu 3+ ions. In accordance with Judd-Ofelt theory, the intensity parameters for f-f transitions from the emission and absorption spectrum were determined. At the 5 D 0 excited state of Eu 3+ , total spontaneous emission probabilities (A R ), lifetimes (τ R ), branching ratios (β R ), and quantum efficiency (η) were calculated. The ZGO:xEu 3+ (x = 0.02, 0.03, 0.04) phosphor showed the branch ratio β ( 5 D 0 → 7 F 2 ) > 60%, indicating that the phosphors prepared here have a promising potential as laser light. The sample with a concentration of 0.04Eu 3+ achieved the highest quantum efficiency of 84%, suggesting that it has potential light-emitting diode applications.
(© 2022 John Wiley & Sons Ltd.)
Databáze: MEDLINE
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