Red luminescence CaSiO3:Eu3+ eco-friendly nontoxic phosphor derived from biomass for display and latent finger print applications
M. Krishnam Raju, Pooja Yadav, M. Gangadhar, S. Patel, Raj Kumar Samudrala, Anita Kumari, M. Bramanandam, P. Abdul Azeem
Abstract
Red luminescent Eu 3+ activated CaSiO 3 phosphor has been prepared by facile green synthesis hydrothermal route using biomass. Future technologies will be required to synthesize on a massive scale using quick, easy, and affordable ways. The current study deals with the preparation of CaSiO 3 :Eu 3+ using egg shell and rice husk ash. The synthesized powders had a single phased monoclinic structure with space group P1 21/C1. It has been found that addition of Eu 3+ ion dopant causes decrease in the optical energy band gap. The phosphor exhibits the intense peak at 612 nm corresponds to 5 D 0 → 7 F 2 of the Eu 3+ anions upon excitation at 392 nm. The lifetimes ranged from 1.90 to 3.53 ms. With an increase in Eu 3+ concentration, emission was tuned towards the red area of the CIE diagram. In order to detect hidden fingerprints on flat surfaces using the powder dusting approach, the CaSiO 3 :Eu 3+ effectiveness was also evaluated. The nontoxicity of CaSiO 3 :Eu 3+ was validated by carrying out a cell viability test on MG 63 cell lines. These outcomes demonstrated that the luminescent CaSiO 3 :Eu 3+ can be used as potential material for display, security encoding, and latent fingerprint applications.