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Synthesis and photoluminescence properties of novel red-emitting phosphors for light emitting diodes

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Abstract

The novel red-emitting phosphors K2Ba1−x (MoO4)2: xEu3+(0.02≤x≤0.15) phosphors were prepared by solid-state reaction and their crystal structures, photo luminescent characteristics were investigated. The results show that all samples can be efficiently excited by UV (396 nm) and blue (466 nm) light, which are coupled well with the characteristic emission from UVLED and blue LED, respectively. Their emission spectra show intense red emission at 616 nm with line spectra due to the 5D0–7F2 transition of Eu3+. The XRD and photoluminescence experimental results indicate that the K2Ba(MoO4)2: Eu3+ phosphor crystallization optimum annealing temperature occurs at about 800°C. The optimum doping concentration of Eu3+ is 0.10 mol, and the critical transfer distance (Rc) among Eu3+ ions is calculated to be about 11.126 Å. The approach to charge compensation was used: Ba2+→Eu3++X− (X=F, Cl, Br), and the charge compensation influence on the luminescent intensity of phosphors is investigated.

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Authors and Affiliations

  1. Key Laboratory of Catalysis and Material Science of the State Ethnic Affairs Commission & Ministry of Education, College of Chemistry and Material Science, South-Central University for Nationalities, Wuhan, 430074, Hubei, P.R. China

    Q. Li, J. Huang & D. Chen

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  1. Q. Li
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  2. J. Huang
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  3. D. Chen
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Correspondence to D. Chen.

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Li, Q., Huang, J. & Chen, D. Synthesis and photoluminescence properties of novel red-emitting phosphors for light emitting diodes. Appl. Phys. B 103, 521–526 (2011). https://doi.org/10.1007/s00340-010-4304-3

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  • DOI: https://doi.org/10.1007/s00340-010-4304-3

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