Tunable luminescence and realization of warm white light via energy transfer from Dy3+/Er3+/Sm3+ triply doped glasses for photonic applications

Abstract

The spectroscopic exploration of Dy 3+ /Er 3+ /Sm 3+ singly, doubly and triply doped BaO + ZnF 2 +K 2 O + SiO 2 +B 2 O 3 glasses have been carried out through photoluminescence excitation and emission, decay profiles, CIE color co-ordinates and correlated color temperature (CCT) values. Co-occurrence of Dy 3+ , Er 3+ and Sm 3+ luminescent bands in the fluorescence spectra of Dy 3+ /Er 3+ /Sm 3+ triply doped multicomponent borosilicate glasses with different excitation wavelengths (348, 374, 379 and 400 nm) emphasizes the existence of energy transfer processes and is studied in detail. The luminescence intensity of Er 3+ and Sm 3+ bands has shown a remarkable reduction with the increase in Dy 3+ content, whereas Dy 3+ bands seemed to be enhanced monotonously. Luminescent kinetics of as-prepared samples were investigated thoroughly by using recorded decay profiles and the observed decrement in lifetime values validated proposed Er 3+ (or Sm 3+ ) to Dy 3+ energy transfer routes. The energy transfer efficiency was considerably increased with the increase in concentration of Dy 3+ ions and is substantially interpreted using partial energy level diagrams. The estimated CCT values and CIE color co-ordinates of the prepared samples were significantly changed from reddish-orange to warm white light and it suggests the suitability of the material for lighting applications. • Multicomponent borosilicate glass is optically activated with Dy 3+ /Er 3+ /Sm 3+ ions. • The influence of Dy 3+ ions on the spectroscopic properties of triply doped glasses was examined. • Luminescent kinetics of as-prepared samples were investigated thoroughly by using photoluminescence decay profiles. • Energy transfer from Er 3+ (or Sm 3+ ) to Dy 3+ occurs. • Tunable luminescence was observed in the glassy system under different excitation wavelengths.