Non-doped phosphor for WLED with high CRI and R9
Vol. 132 No. 1B (2023), Original Article
Vol. 132 No. 1B (2023)

Non-doped phosphor for WLED with high CRI and R9

Original Article
https://doi.org/10.26459/hueunijns.v132i1B.6838
Published 2023-06-30
Thi To Nu Dang
Faculty of Natural Sciences, Quy Nhon University, 170 An Duong Vuong St., Quy Nhon, Binh Dinh, Vietnam
Minh Thong Nguyen
International Training Institute for Materials Science (ITIMS), Hanoi University of Science and Technology (HUST), 1 Dai Co Viet St., Hanoi, Vietnam
Nguyen M.C.H.P. Lan
International Training Institute for Materials Science (ITIMS), Hanoi University of Science and Technology (HUST), 1 Dai Co Viet St., Hanoi, Vietnam
Xuan Viet Dao
International Training Institute for Materials Science (ITIMS), Hanoi University of Science and Technology (HUST), 1 Dai Co Viet St., Hanoi, Vietnam
Le Thi Thao Vien*
Faculty of Natural Sciences, Quy Nhon University, 170 An Duong Vuong St., Quy Nhon, Binh Dinh, Vietnam
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Keywords

Zn-Sn-O compound
photoluminescence of Zn2SnO4
full visible range

How to Cite

1.
Dang TTN, Nguyen MT, Nguyen ML, Dao XV, Le TV. Non-doped phosphor for WLED with high CRI and R9. hueuni-jns [Internet]. 2023Jun.30 [cited 2024May15];132(1B):83-91. Available from: https://jos.hueuni.edu.vn/index.php/hujos-ns/article/view/6838
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Abstract

The effect of the ZnO/SnO2 ratio on phase formation and optical properties of the Zn-Sn-O compound was investigated by varying the ZnO/SnO2 molar ratio (ZnO/SnO2  = 1:2, 1:1, 2:1, 3:1, and 4:1). All samples were synthesised with high-energy planetary ball milling, followed by calcination at 1000 °C in the air. The result from X-Ray diffraction patterns (XRD) shows that the single-phase Zn2SnO4 is achieved at the ZnO/SnO2 ratio of 2:1. Whereas, the mixed phase of ZnO and Zn2SnO4 formed when ZnO is more than SnO2 (3:1 and 4:1). On the other hand, the XRD patterns of the products obtained at a ratio where SnO2 is more than ZnO present a mixture of SnO2 and Zn2SnO4. The photoluminescence of the two samples with the ratio of 2:1 and 1:3 gives full-visible range spectra from 400 to 800 nm, which are in the blue-far-red region centred at about 514, 580, and 690 nm. Temperature-dependent luminescence measurements were also carried out in this work, and the results indicate that the prepared phosphor Zn-Sn-O at the ZnO/SnO2 ratio of 1:2 has thermal stability. The obtained material was used to coat near UV LED chips, and the WLED possesses the highest CRI of 95. The SnO2-Zn2SnO4 powder can be used as a phosphor for WLED applications with high CRI and R9.

https://doi.org/10.26459/hueunijns.v132i1B.6838
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