Unwavering red emission from Eu3+ activated Li6AlGd(BO3)4 phosphors

The Li6AlGd(BO3)(4):xEu(3+) phosphors were synthesized by solid phase reaction technique. The crystalline phase, morphology and photoluminescence properties were investigated using X-ray diffractometer, scanning/transmission electron microscope and fluorescence spectrophotometer, respectively. Up on 395 nm near ultra violet excitation, the Li6AlGd(BO3)(4):xEu(3+) phosphors exhibit intense red emission through D-5(0) -> F-7(J) (J = 0, 1, 2, 3, 4) transitions. The concentration of Eu3+ ions was optimized as 4.0 mol% for efficient red emission at 395 nm excitation. The CIE colour coordinates (0.647, 0.352) are very close to the National Television System Committee red coordinates and commercial red phosphors. The luminescence thermal resistance was examined by studying the temperature dependence luminescence at 395 nm excitation. The quantum efficiency was estimated using the integrated intensity of emission peaks and decay time. The experimental observations show that the Li6AlGd(BO3)(4):xEu(3+) (x = 4.0 mol%) phosphor has greater proficiency as red component in the design of white LEDs and display devices.