Structural, optical and morphological features of combustion derived Ba3Y4O9: Dy3+ nanocrystalline phosphor with white light emission

Abstract

A simple and highly efficient route of solution combustion process was utilized for preparing a series of white light emanating Ba3Y4(1-x)O9: 4xDy3+ (x = 0, 1.0, 3.0, 5.0, 10, 15 mol%) nanocrystalline phosphors. The resulted product was claimed to belonging to R3 space group (SG) with trigonal crystal system related to hexagonal crystal family utilizing powder X-ray diffraction (PXRD) technique and Rietveld refinement. The photoluminescence emission spectra comprised of two intense bands; one was yellow band (Y) in consequence of 4F9/2 → 6H13/2 transition positioned at 578 nm and another one was blue band owing to 4F9/2 → 6H15/2 transition sited at 489 nm. Ba3Y3.88Dy0.12O9 composition was considered as optimal composition for white light emission amongst the prepared nanophosphors owing to its maximal intense emission. The morphological aspects and elemental composition of the optimized sample were analyzed with the help of scanning electron microscopy (SEM), transmission electron microscopy (TEM) and energy dispersive X-ray analysis (EDAX) studies. CIE (International Commission on Illumination) chromaticity coordinates confirmed the white light emission by all the synthesized nanophosphors that validate their potential applications in white light emitting diodes (WLEDs). Correlated color temperature (CCT) analysis substantiates their applications as cool white light source.