Abstract:
A new orange-red emitting phosphor La3−xNbO7:xEu
3+
(x=0.05, 0.10, 0.15, 0.20) was prepared by a solidstate reaction route. Studies revealed the incorporation of Eu
3+
into two differently coordinated La
3+
sites,
thereby favoring the multiband emission. Absorbance, photoluminescence excitation, emission and concentration dependence of Eu
3+
luminescence were investigated. The results indicate that the host exhibited high
absorption in the UV region which enabled effective energy transfer from NbO6
7−
groups to Eu
3+
excitation
levels. Intense orange red emissions were observed under near UV (394 nm) and blue (464 nm) excitations
nicely matching with the output wavelengths of UV and blue LED chips. The emission intensity of the phosphor
under blue excitation is nearly twice that of the phosphor under near UV irradiation. Thus the intense orange red
emitting host sensitized phosphor could be a promising phosphor candidate in generating white light combined
with the blue chip.
