Charge-transfer nature in luminescence of YNbO4 :Bi blue phosphor
نویسندگان
چکیده
Bismuth doped yttrium niobate (YNbO4:Bi) is a potential blue phosphor for field emission displays application. It is observed after introducing Bi ions that cathodoluminescence efficiency of YNbO4:Bi becomes lower than that of YNbO4 . From the calculations of critical distance (RC) of energy transfer and Huang–Rhys parameter (SHR) of YNbO4:Bi, it is found that the energy transfer by a dipolar-type interaction is unlikely compared with that of a short-range interaction possible in the luminescence of YNbO4:Bi. Thus, it is believed that the luminescence property of YNbO4:Bi is mainly affected by the host lattice YNbO4 having self-luminescent NbO4 32 complex. By time-resolved spectroscopy, it is found that luminescence characteristics of activator Bi in YNbO4:Bi shows a charge-transfer behavior. © 2001 American Institute of Physics. @DOI: 10.1063/1.1413954#
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