Cool/ warm white light luminescent traits and energy transfer studies of Dy3+/Er3+/Sm3+ triply doped multicomponent borosilicate glasses for lighting applications

This paper reports the synthesis of Dy3+/Er3+/Sm3+ ions singly and triply doped with multicomponent borosilicate glasses by conventional melt quench technique. Presence of an additional excitation band at 374 nm in the excitation spectrum corresponding to Dy3+ (λemi = 574 nm) reveals the possibility of obtaining the fluorescence spectra of Dy3+, Er3+, and Sm3+ together and predicts the presence of energy transfer in the prepared triply doped glassy system. Surprisingly, the luminescent bands owing to Dy3+, Er3+, and Sm3+ ions were observed in every luminescence spectra recorded with 374, 379, and 400 nm excitation wavelengths. The intensity of Dy3+ and Er3+ emission peaks showed a remarkable decrement with an increase in Sm3+ concentration, while Sm3+ bands seemed to be enhanced monotonously. The recorded emission intensities were further characterized by using CIE diagram and obtained CIE coordinates and CCT values recommend the glasses for cool or warm near white light emitting applications.