Enhanced photoluminescence behaviour of Eu3+ activated ZnMoO4 nanophosphors via Tb3+ co-doping for light emitting diode

Abstract

In the present study, structural and photo-luminescence studies of Eu3+ and Tb3+ co-doped ZnMoO4 host matrix has been investigated in detail. ZnMoO4:Eu3+/Tb3+ have been synthesized via a simple and cost effective co-precipitation method. XRD, Raman and FTIR studies confirmed its triclinic structure of Eu3+/Tb3+ co-doped ZnMoO4 host. Emission spectra of the measured samples corroborate the dominant electric dipole transition emission (5D0-7F2) intensity over magnetic dipole transition emission (5D0-7F1) intensity. Moreover, the improvement in red emission (5D0-7F2) for Eu3+(3 at%) and Tb3+(2 at%) and high asymmetric ratio ∼10.4 is observed which dictates it as a highly red emitter. Additionally, commission international de-I′ Eclairage (CIE) values approaches to NSTC. Color purity of red emission improves after Tb3+ co-doping. Photoluminescence studies reveals that Tb3+ acts as a sensitizer for the Eu3+ activated ZnMoO4 host matrix. Study reveals that Eu3+/Tb3+ co-doped ZnMoO4 can be excited by near UV device, which is bottleneck in the advancement of LEDs technology. © 2017 Elsevier B.V.