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Spectral broadening of blue apatite phosphors (Sr, Ba)5(PO4)3Cl:Ce3+ was achieved by changing Sr–Ba combinations. The blue colors came from 5d1 to 4f1 transitions of Ce3+ ions, and the excitation bands were ranged from 250nm to 400nm. The broad Raman spectrum in Sr2.45Ba2.45(PO4)3Cl:Ce3+ supported its highest disorder, leading to the spectral broadening with a half width of 95.5nm. The temperature...
Heavily-doped Zn2SiO4:Mn2+ phosphors showed a strong 422nm photoluminescence excitation from 6A1→4A1 forbidden transitions of Mn2+ ions and an intensive 530nm peak emission from 4T1→6A1 forbidden transitions with excellent thermal stability (90% @ 200°C). The photoluminescence enhancement under 422nm excitation was explained in terms of the relaxation of selection rule on the forbidden intra-transitions...
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