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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 17, Iss. 23 — Nov. 9, 2009
  • pp: 21169–21178

Luminescence from Bi2+-activated alkali earth borophosphates for white LEDs

Mingying Peng, Ning Da, Sebastian Krolikowski, Alfons Stiegelschmitt, and Lothar Wondraczek  »View Author Affiliations


Optics Express, Vol. 17, Issue 23, pp. 21169-21178 (2009)
http://dx.doi.org/10.1364/OE.17.021169


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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 2P1/22S1/2 and 2P1/22P3/2 could be observed and quantified. Excitation to 2P3/2 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.

© 2009 OSA

OCIS Codes
(160.2540) Materials : Fluorescent and luminescent materials
(160.4670) Materials : Optical materials

ToC Category:
Materials

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

Citation
Mingying Peng, Ning Da, Sebastian Krolikowski, Alfons Stiegelschmitt, and Lothar Wondraczek, "Luminescence from Bi2+-activated alkali earth borophosphates for white LEDs," Opt. Express 17, 21169-21178 (2009)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-17-23-21169


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