Abstract

Bi²⁺-doped MBPO₅ (M = Ba²⁺, Sr²⁺, Ca²⁺), synthesized in air via solid state reaction, are considered as novel orange and red phosphors for white light emitting diodes with improved colour quality. Absorption of Bi²⁺ due to ²P_1/2→²S_1/2 and ²P_1/2→²P_3/2 could be observed and quantified. Excitation to ²P_3/2 is accompanied by vibronic sidebands, and corresponding emission behaviour is found. The electron-phonon coupling strength increases in the order M = Ba²⁺→Sr²⁺→Ca²⁺. In the case of MBPO₅:Bi²⁺, one-, two- and even three-phonon sidebands could clearly be observed. The crystal structure of all three compounds belongs to space group P3₁21. Bi²⁺ is incorporated on M²⁺ sites, and reduction of Bi³⁺ to Bi²⁺ occurs for reasons of charge compensation. In accordance with crystallographic data, fluorescence decay behaviour indicates that only one type of Bi²⁺-emission centers is present.

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History
Original Manuscript: September 29, 2009
Manuscript Accepted: October 15, 2009
Revised Manuscript: October 15, 2009
Published: November 6, 2009

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Author Affiliations

Mingying Peng, Ning Da, Sebastian Krolikowski, Alfons Stiegelschmitt, Lothar Wondraczek

Chair of Glass and Ceramics, Department of Materials Science – WW3, University of Erlangen-Nuremberg, Erlangen 91058, Germany

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