Synthesis of Ba2Si3O8:Eu2+ Phosphor for Fabrication of White Light-Emitting Diodes Assisted by ZnCdSe/ZnSe Quantum Dot

Abstract

Bluish green-emitting Eu2+-doped barium silicate (Ba2Si3O8:Eu2+) phosphor was synthesized via a conventional solid-state reaction chemistry, and Eu concentration and firing temperature were optimized toward its highest luminescent efficiency. Ba2Si3O8:Eu2+ phosphor could be excited under near-UV wavelengths and exhibited a broad emission band (5d -> 4f transition of Eu2+) due to the strong coupling of Eu activator with the surrounding host. Phosphor-converted (pc) light-emitting diode (LED) was fabricated by combining Ba2Si3O8:Eu2+ phosphor with a near-UV LED. To fabricate white LED with a high color rendering index, a highly efficient orange-emitting ZnCdSe/ZnSe core/shell quantum dot was incorporated with an unconventional layered design into the above Ba2Si3O8:Eu2+ phosphor-based pc-LED and their electroluminescent properties are described. (C) 2010 The Electrochemical Society. [DOI: 10.1149/1.3465655] All rights reserved.