Luminescence characteristics of Eu2+-activated white-emitting phosphor prepared from solar cell cutting Si powder

doi:10.3969/j.issn.1000-5641.2018.02.012

Abstract

Abstract: Eu²⁺-activated white-emitting phosphors were synthesized by the process of ammonia nitridation at high temperature with the raw material of silicon powder from crystalline silicon solar cells cutting sludge. The effect of Eu²⁺ doping concentrations on structural and luminescent properties of phosphors was studied in detail. It turns out that the principal crystalline phase of the sample is the mixture of Ca₂SiO₄, CaSiO₃ and Ca₂Si₅N₈. These phosphors can be effectively excited in the range of 300~450 nm, showing intense absorption in ultraviolet to near-ultraviolet region. In addition, they exhibit intense white emissions with CIE (Commission Internationale de L'Eclairage) coordinates of (0.327 5, 0.386 6) under 370 nm excitation with color temperature of 5 705 K(5 431.85℃). There are two luminescence centers in the host, which locate at 470 nm and 570 nm, respectively. With the increase of the doping concentration of Eu²⁺, the emission reaches an intensity saturation and the optimum doping content of Eu²⁺ is 10.0 mol% due to the interaction among the activator ions which result in an concentration quenching. Using such a single phosphor, a white light output can be directly achieved combined with UV chip.

Key words: ammonia nitridation, Eu²⁺ doping, nitride phoshor, white LED

CLC Number:

O482.31

YU Xin-yang, CAI Ya-guo, SUN Zhuo, PIAO Xian-qing. Luminescence characteristics of Eu²⁺-activated white-emitting phosphor prepared from solar cell cutting Si powder[J]. Journal of East China Normal University(Natural Sc, 2018, 2018(2): 115-124.

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Luminescence characteristics of Eu²⁺-activated white-emitting phosphor prepared from solar cell cutting Si powder

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