Journal
OPTICS EXPRESS
Volume 20, Issue 20, Pages 22569-22578Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.20.022569
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Funding
- National Natural Science Foundation of China [51072060, 51132004, 51102096, 11174085]
- Fundamental Research Funds for the Central Universities [2011ZZ0001]
- Guangdong Natural Science Foundation [S2011030001349]
- SRF for ROCS SEM
- Guangdong Undergraduate Innovative Research and Training Program of SCUT [1056111036]
- Fok Ying Tong Education Foundation [132004]
- Chinese Program for New Century Excellent Talents in University [NCET-11-0158]
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A new type of bismuth doped Ba2B5O9Cl crystal is reported to exhibit broadband near infrared (NIR) photoluminescence at room temperature, which has been identified here originating from elementary bismuth atom. Rietveld refining, static and dynamic spectroscopic properties reveal two types of Bi-0 centers in the doped compound due to the successful substitution for two different nine-coordinated barium lattice sites. These centers can be created only in a reducing condition, and when treated in air and N-2/H-2 flow in turn, they can be removed and restored reversely. As the dwelling time is prolonged in N-2/H-2 at high temperature, conversion from Bi2+ to Bi-0, as reflected by changes of their relative emission intensities, is witnessed in the crystal of Ba2B5O9Cl:Bi. The lifetime of the NIR luminescence was observed in a magnitude of similar to 30 mu s, rather different from bismuth doped either glasses or crystals reported previously. (C) 2012 Optical Society of America
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