Abstract
LaAlO3:Dy3+ (1–11mol%) nanophosphors (NPs) were synthesized using solution combustion route and the final product was well characterized. The bandgap energy (Eg) was estimated using diffuse reflection data and the value was found to be in the range 5.70 – 5.90eV. Upon ~ 353nm [6H15/2 → 6P5/2] excitation, a characteristic emissions peaks of Dy3+ ions were recorded at ~ 480, 576 and 673nm and ascribed to transitions from 4F9/2 to 6H15/2,6H13/2 and 6H11/2 respectively. Judd–Ofelt parameters (Ω2, Ω4 and Ω6), transition probabilities (AT), quantum efficiency (η), luminescence lifetime (τrad), branching ratio (β), color chromaticity coordinates (CIE) and correlated color temperature (CCT) values were estimated from the emission spectra and discussed in detail. The estimated branching ratio was found to be ∼75%, as a result the phosphor may be potentially useful for display device applications. Further, the optimized LaAlO3:Dy3+ (5mol%) nanophosphor can be effectively used in the white light emitting diodes (WLEDs) under NUV excitation.
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