Study on the luminescence behavior of Dy3+ ions activated, modifier dependent alkali boro-tellurite glasses for white LED application

Abstract

In the present study, an exclusive set of modifiers incorporated Dy3+ activated alkali boro-tellurite glasses is fabricated via classic melt-quenching process. The structural and molecular studies are made through XRD, FTIR and Raman analyses. The spectroscopic and radiative characteristics of the prepared glasses are explored through absorption, luminescence and decay spectral studies. The bonding nature between dopant and ligand field is analysed with the bonding parameters which detected the nature of the glasses to be ionic. The computed JO parameters trail the course Ω2 > Ω4 > Ω6 consistently for all the samples that depicts their asymmetric nature. Among the three observed transitions, a strong yellow emission is detected due to the increase in population density of the 6H13/2 level (4F9/2→6H13/2). The evaluated radiative features of the glasses prove their lasing capability. The zinc containing glass (BTZNKD) owns higher stimulated emission cross-section (σsec) which makes it applicable for lasing actions and w−LED application in medical diagnosis. The stimulation of white light for the prepared glasses is examined through colorimetric investigations including CCT, color purity and Y/B ratio. The radiative lifetime is calculated for all the glasses through the non-exponential decay and the estimated luminescence efficiency is higher for the BTZNKD (78%) glass. In summary, the BTZNKD glass is more suitable for white light generation and lasing applications.