Li4SrCa(SiO4)2:Ce3+, a highly efficient near-UV and blue emitting orthosilicate phosphor

High quantum efficiency is a vital parameter of phosphors for practical application. An efficient near-UV and blue emitting phosphor Li4SrCa(SiO4)(2):Ce3+ was synthesized by a traditional solid-state reaction, and luminescent properties were studied in detail. The Ce3+-activated phosphor can emit both a near-UV light centred at 345 nm and a blue light peaking at 420 nm when Ce3+ occupies the Sr and Ca site, respectively. The internal quantum efficiency (IQE) of Li4SrCa(SiO4)(2):0.03Ce(3+) is as high as 97% under the excitation at 288 nm, while the external quantum efficiency (EQE) is 66%. The IQE and EQE values of Li4SrCa(SiO4)(2):0.03Ce(3+) under the excitation at 360 nm are 82% and 31%, respectively. (C) 2015 Elsevier B.V. All rights reserved.