Synthesis of double perovskite ba2yzro6 eu3 sr2yzro5 5eu3 Basryzro5 5eu3 and ternary type bay2zno5eu3 red phosphors for PC led and forensic applications

Abstract

The origin of luminescence, various types and its applications have been described. Lanthanide doped phosphors, their optical properties, and operational essentials for applications in solid-state lightings, pc-LEDs, and forensic science have been discussed. Rare earth (Eu3+) doped zirconium and zinc oxide-based red phosphor were reviewed thoroughly. The scope of the present study is also discussed. newlineThe preparation of pure and Eu3+ doped BaY2ZnO5/ Ba2YZrO6 / Sr2YZrO5.5 / BaSrYZrO5.5 phosphors and characterization through XRD, SEM, and PL analysis were made. It details the modified solid-state reaction adopted for the preparation of the above materials with different molar concentrations of europium. The instrumental techniques of XRD, SEM, and Spectrofluorometer (PL) are also explained. newlineThe prepared Eu3+ activated BaY2ZnO5 phosphor were investigated by XRD, PL, and SEM analyses. Rietveld refinement analysis was carried out to confirm the structure of the synthesized phosphor. The prepared phosphor shows an intense red emission around 627 nm under excitation by near UV light. The 5D0-7F2 transition intensity of the prepared phosphor is three times higher compared to the commercial (Y,Gd)BO3:Eu3+ red phosphor. The CIE color coordinate value of BaY2ZnO5:Eu3+ (9mol%) phosphor corresponds to (0.6169, 0.3742) and it has a high 97.9% colour purity. The obtained results reveal the utility of BaY2ZnO5:Eu3+ phosphor as an efficient red component in WLEDs, anti-counterfeiting and latent fingerprint detection applications. newlineA new Eu3+ doped Ba2YZrO6 red phosphor having a perovskite cubic structure with well-dispersed homogeneous cubic morphology is identified. It exhibits intense red emission around 612 nm when excited efficiently by near UV and blue light. newline