Up-Conversion Luminescence of Er3+/Pr3+/Yb3+ Co-doped LaNbO4 Phosphors

Autor: J. C. Sales, Humberto Dionísio de Andrade, Marcello X. Façanha, Idalmir de Souza Queiroz Júnior, Felipe F. do Carmo, João P.C. do Nascimento, D. X. Gouveia, Antonio Sergio Bezerra Sombra
Rok vydání: 2020
Předmět:
Zdroj: Journal of Electronic Materials. 49:6009-6015
ISSN: 1543-186X
0361-5235
DOI: 10.1007/s11664-020-08329-x
Popis: Er3+–Pr3+–Yb3+ co-doped LaNbO4 (LNO) phosphors were obtained by solid-state reaction and their up-conversion properties have been studied. The x-ray diffraction and Rietveld’s refinement revealed no evidence of significant structural changes or secondary phases in the synthesized materials. According to the up-conversion measurements, the observed emissions are due to Er3+ ions which are present as unintentional contaminant in the Pr3+ doped and Pr3+–Yb3+ co-doped systems. The intensity of all the bands was enhanced with increasing Yb3+ concentration, and at 8%Yb3+ a significant decrease of the green and red emissions was found due to the presence of cross-relaxation process between Er3+ and Pr3+ ions, mainly for green emissions because of the back energy transfer mechanisms from Er3+ to Yb3+. The Commission Internationale de l’eclairage color coordinates of almost all samples were located in the green region, while for the LNO: Pr 0.1%–Yb8% phosphor they were located in the blue region. Red–Green–Blue phosphors were obtained from LaNbO4: Pr3+/Er3+/Yb3+ systems using the pair of activators Pr3+/Er3+ which is not commonly investigated in the literature.
Databáze: OpenAIRE
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