Photoluminescence dynamics and structural characteristics of green-glimmering vanadate-based nanophosphors for progressive optoelectronic applications

Fair green emission is observed in the Er3+ activated Ca9Bi(VO4)7 nanocrystalline material series fabricated via solution combustion methodology. A crystal prototype of the trigonal phase with R3c (161) space group having irregularly shaped grains with sizes between 43 and 61 nm is formed. Morphological aspects are examined via scanning and transmission electron microscopy (SEM and TEM). On near-UV excitation, the photoluminescence spectrum presents a good green emission at 18182 cm−1 wavenumbers consistent with the electronic transition 4S3/2→4I15/2. The energy transfer phenomena are also discussed. The highest luminous intensity is observed for 8.0 mol% of Er3+ composition (synthesized via solution combustion technique) with 382 nm excitation. d–q Exchanges authorized the presence of the concentration quenching phenomenon. Time decay analysis and non-radiative energy transfer mechanisms were also explored. Diffuse reflectance spectroscopy was taken into use to explore the energy bandgap, which lies in the semiconductor domain. The CIE coordinates lay in the greenish zone of the chromaticity plan, thus confirming their latent contention in pc-WLEDs and other innovative optoelectronic claims.