Enhancing optical properties of WLEDs with LaOF:Eu3+&SiO2 application

After many efforts, the core-shell nanostructure of LaOF:Eu3+&SiO2 that emits bright red radiation can be fabricated by simple solvothermal application succeeded by heat treatment. The resulted particles from the fabrication process are small in size, able to demonstrate circular form more efficient and prevent stacking. Emissions spectra of photoluminescence (PL) that display strong peaks of 593 nm, 611 nm, and 650 nm are 5D0 —>7FJ (J=0, 1 and 2), respectively, Eu3+ transitions. Judd-Ofelt (J-O) theory estimates spectral strength parameters and Eu-O ligand behavior. It has been noticed that CIE co-ordinates are very similar to regular NTSC values (x=0.63, y=0.36). Besides, the correlated color temperature value can be observed at below 5000 K, which is 3475 K, and thus it is ideal for warmlight diodes. A fluorescent marker for identification of latent fingerprints was used with the tailored core-shelled SiO2 (coat III)@LaOF:Eu3+ (5 mole %) on porous and non-porous surfaces. The results of fingerprint have high sensitivity, selectivity and also has no obstruction caused by the back-ground which supports level-I to level-III fingerprint ridge recognition. The experiments outcomes suggest that the enhancements brought by the coreshell NS structure can be further examined to apply in forensic and solid state lightning applications