Study on the structure and luminescence properties of a novel Li3Sc2(PO4)3: Eu3+ orange-red emission phosphor for wLEDs

Abstract

The manufacture of high-efficiency and stable red phosphor is the key to solve the matter of high color temperature and poor color rendering of commercial white light-emitting diodes (wLEDs). In this work, a series of Li3Sc2-x(PO4)3: xEu3+ (x = 0–0.4) phosphor samples were prepared by conventional solid-phase reaction. The structure and optical properties of Li3Sc2(PO4)3: Eu3+ are investigated. When the doping amount of Eu3+ is 0.3 mol, phosphors have the highest luminescence intensity. The temperature-dependent characteristics of the prepared phosphors are studied. The combined emission intensity at 423K is 77.4% of that at 298K, showing significant thermal stability. Finally, the prepared Li3Sc2(PO4)3 phosphor package is tested in the LED device. The results of the color temperature of 5423K, as well as color rendering index (CRI) (Ra = 81.6) and color coordinate CIE (0.3343, 0.3471), are satisfactory, suggesting that this red phosphor has potential for wLEDs applications.