Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 851, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2020.156875
Keywords
Luminescence; Tantalate; CaY0.5Ta0.5O3; Plant-growth LED
Categories
Funding
- Natural Science Foundation of Shaanxi Province [2018JM5055]
- Fundamental Research Funds for the Central Universities [2452019076]
- Undergraduate Innovation Fund of Northwest AF University [201910712037, 202010712006]
- Hunan Provincial Key Laboratory of Xiangnan Rare-Precious Metals Compounds and Applications [2019XGJSKFJJ01]
- Construction Program of the key discipline in Hunan Province
- Projects of the Education Department of Hunan Province [18A465]
- Science and Technology Plan Project of Chenzhou city [jsyf2017014]
- National Natural Science Foundation of China [11804265]
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By optimizing the reaction temperature, deep-red emitting CaY0.5Ta0.5O3:Mn4+ phosphors were synthesized with a strong luminescence intensity. The photoluminescence spectra exhibited a deep-red broadband luminescence, with a dominant peak at 680 nm due to the transition of Mn4+ in TaO6 octahedral structures.
Deep-red emitting CaY0.5Ta0.5O3:Mn4+ phosphors were obtained by optimizing the reaction temperature. The structure of CaY0.5Ta0.5O3:Mn4+ consisted of a double perovskite with the Pnma (62) space group. The luminescence intensity of the synthesized CaY0.5Ta0.5O3:Mn4+ at 1550 degrees C was twice as strong as that at 1500 degrees C. The photoluminescence spectra of the synthesized CaY0.5Ta0.5O3:Mn4+ phosphor exhibited a deep-red broadband luminescence from 650 nm to 750 nm with a 680 nm dominated peak due to the E-2(g) -> (4)A(2g) transition of Mn4+ in TaO6 octahedral structures. The optimal concentration for the CaY0.5Ta0.5O3:xMn(4+) phosphor was 0.3 mol.%. The concentration quenching effect was ascribed to the dipole-quadrupole interaction. The decay time (0.398-0.171 ms) indicated that the forbidden character of 3d transitions existed among Mn4+. The crystal field strength and the Racah parameters were discussed to estimate the nephelauxetic effect of Mn4+ in the CaY0.5Ta0.5O3 host. Besides, the red light-emitting diodes (LEDs) were packaged using the CaY0.5Ta0.5O3:0.3%Mn4+ phosphor and a 368 nm near-ultraviolet chip. The emission spectrum of the red LED overlapped with the absorption curves of chlorophylls a and b. Results indicated that the CaY0.5Ta0.5O3:Mn4+ can serve as a component of the deep-red light in plant-growth LEDs. (C) 2020 Elsevier B.V. All rights reserved.
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