Cerium-ion-doped yttrium aluminum garnet nanophosphors prepared through sol-gel pyrolysis for luminescent lighting

Lu, Chung-Hsin; Jagannathan, R.
May 2002
Applied Physics Letters;5/13/2002, Vol. 80 Issue 19, p3608
Academic Journal
Luminescent Y[sub 3]Al[sub 5]O[sub 12]: Ce[sup 3+] [yttrium aluminum garnet (YAG):Ce[sup 3+]] nanoceramics (5–50 nm) have been prepared through a facile sol-gel pyrolysis route. A blueshift of about 720 cm-1 in the reflectance spectra near the absorption edge can be observed for YAG:Ce[sup 3+] nanoparticles (having an average particle size around 5 nm) with respect to the submicron powders (∼0.9 μm). Furthermore, the scope of application for this important luminescent system can be extended by isostructural substitution with heavier cations such as Ba[sup 2+]. This substitution giving rise to an oxygen-vacancy defect complex, that exhibits certain size-sensitive exciton-impurity energy-transfer property in YAG:Ce[sup 3+] nanoparticles. © 2002 American Institute of Physics.


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