Spectroscopic characterization of Eu3+-doped KSrYSi2O7 phosphor for NUV LEDs: Estimation of the Judd Ofelt parameter

In this study, a series of Eu3+-doped KSrYSi2O7 phosphors were synthesized by employing the conventional combustion method. Phase confirmation revealed that the synthesized phosphor had a monoclinic structure with the P21/m phase group. For studying the effect of doping on the bandgap, the effect has been observed by applying the Kubelka-Munk function. The emission profile of the synthesized phosphor was recorded by stimulation with radiation of 239 nm. The recorded profile reveals the characteristics of the Eu3+ ions, which are concomitant with the f-f transitions. In addition, studying the quenching phenomenon, optical transition parameters corresponding to the Eu3+ ions were estimated using the Judd-Ofelt theory to validate the local symmetry properties. The thermal stability of the synthesized phosphor was also thoroughly studied. The temperature-dependent emission spectra of the prepared phosphors revealed the good thermal stability of the present phosphors, with a high activation energy of around 0.24 eV. The excellent color purity of 90.4% and thermal stability, along with the Commission International del’Eclairage (CIE) coordinates of (x = 0.551 and y = 0.436), suggest the suitability of the phosphor for use in different light-emitting applications.