Luminescent Properties and Mechanism of Gd_1-x-yAlO₃:Tb_x,RE_y Gradational Combinatorial Library

Abstract:

The combinatorial material library approach is an excellent innovation for inorganic functional material research, and it can discover and screen new materials efficiently. In this paper, it is used to quickly find and improve Tb₃₊ activated gadolinium aluminate perovskite phosphors (Gd_1-x-yAlO₃: Tb_x, RE_y, RE ion vary among Ce^3+,4+, Dy³⁺, abbreviate as GAP:Tb,RE). Under UV light excitation, Gd_1-x-yAlO₃: Tb_x, RE_y gradational combinatorial library indentifies the “lead” green luminescent compound as GAP:Tb_0.1 from all the GAP:Tb_x (x=0.05~0.15) candidates in a quick way. Then the relationship between sensitizers and activators can be also mapped out quickly, that Dy³⁺, is a good sensitizer for Tb³⁺,activator while Ce^3+,4+ is not a suitable one. The photoluminescent excitation (PLE) and photoluminescent emission (PL) spectral indicate the resonance energy transfer between the activator and sensitizer must have happened, which leads to Ce^3+,4+ co-doping decrease Tb³⁺ green luminescence（⁵D₄→⁷F₅，544nm） while Dy³⁺ co-doping increase green luminescence. The candidates in the library are prepared in powder form by nitric-citric method for more detailed characterization. All the screening results, obtained from the combinational library, are coherent with the powder phosphor experiments.

• Periodical: Advanced Materials Research (Volumes 557-559)
• Pages: 674-679
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.557-559.674
• Online since: July 2012
• Authors: Lan Luo, Zhi Hua Xiong, Nai Gen Zhou, He Peng Zhang
• Keywords: Gadolinium Aluminate Pervokite (GAP), Ion Beam Sputtering, Luminescence, Resonance Energy Transfer, Thin-Film Combinatorial Library

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