Driving the photoluminescent and structural properties of X2-Y2SiO5 by varying the dopant Dy3+ concentration towards cool wLED applications

Abstract Dy 3+ doped Y 2 SiO 5 nanophosphors were synthesized by solution combustion technique using Calotropis gigantean milk latex and NaCl as fuel and flux respectively. Powder X-ray diffraction (PXRD) confirmed the formation of monoclinic X 2 -phase Y 2 SiO 5 belonging to the phase group C 2 /c. Fourier transform infrared spectroscopy (FTIR) shows characteristic metal–oxygen (Y–O) vibration band at 721 cm −1 . Transmission electron microscopic (TEM) and Scanning electron microscopic (SEM) morphological feature exhibits non-uniform almost spherical shaped nanosized particles. The photoluminescence (PL) emission peaks, recorded at 388 nm, showed radiative emissions at 483, 575 and 636 nm respectively. Judd–Ofelt (JO) analysis was carried out to estimate the radiative (A R ) properties, radiative life time (τ R ), branching ratio (β R ) and stimulated emission crossection (σλ p ). The CIE and CCT was estimated using McCamy empirical formula. In the beginning, the CIE co-ordinate values were lying in the light blue region. However, with increase in Dy 3+ concentration the values shifted towards white region. CCT value was found to be ∼6984 K. Therefore, Y 2 SiO 5 :Dy 3+ (9 mol%) can be used for cool day light and WLED applications.