Red photoluminescence due to energy transfer from Eu2+ to Cr3+ in BaAl12O19
2009; Elsevier BV; Volume: 130; Issue: 2 Linguagem: Inglês
10.1016/j.jlumin.2009.09.021
ISSN1872-7883
Autores Tópico(s)Microwave Dielectric Ceramics Synthesis
ResumoAbstact BaAl 12 O 19 –BaAl 2 O 4 doped with Eu 2+ , Cr 3+ and (Eu 2+ +Cr 3+ ) are prepared by solid-state reaction. The spectra of BaAl 12 O 19 –BaAl 2 O 4 :Eu 2+ , Cr 3+ shows that the f–d emission bands from Eu 2+ are centered at 442 and 495 nm and the Cr 3+ yields the emission lines at 694 and 700 nm. Photoluminescence study demonstrates that the red photoluminescence and energy transfer occurs only in the phase of BaAl 12 O 19 not BaAl 2 O 4 though the samples are mixed phases. The fluorescence lifetime measurements indicate efficient energy transfer from Eu 2+ to Cr 3+ in BaAl 12 O 19 : Eu 2+ , Cr 3+ . The energy transfer rate and efficiency are calculated. The results show that the energy transfer rate and efficiency increase following the increase in Cr 3+ concentration.
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