3? and tuning of luminescence in garnet (Y 1?x,La x) 3(Al,Si) 5(O,N) 12: Ce 3+ phosphors]]>

摘要

AbstractSpectrum deficiency in red component of YAG: Ce3+phosphor is hopeful to be made up by small amount of Si4+-N3?replacing Al3+-O2?for high quality lighting, while the important indicators of emission efficiency and thermal quenching properties dramatically decrease in this approach. Thus micro-structural tuning by cation substitution usually is an effective way to improve the luminescence properties. This study focuses on the structural variations and tuning luminescence induced by La3+incorporating into Y3(Al,Si)5(O,N)12: Ce3+phosphors. The results show that the emission efficiency and thermal quenching properties are remarkably enhanced, while the spectrum shows blue-shift to some extent. The mechanism of property variation is clarified, which is ascribed to selective coordination of N3?. This effect is important and possible to be extended to other N3?contained garnet phosphors, becoming an important rule for materials design. The obtained phosphors are promising to develop into practicable phosphors for high color rendition w-LEDs.Highlights?Thermal quenching and emission efficiency was greatly improved by appropriate La3+doping Y3(Al,Si)5(O,N)12:Ce3+.?The mechanism of spectral blue shift was revealed ascribing to selective coordination of N3?.?(Y,La)3(Al,Si)5(O,N)12:Ce3+phosphors with tunable emissions are promising to be used in application of w-LEDs.]]>