Strong blue absorption of green Zn2SiO4:Mn2+ phosphor by doping heavy Mn2+ concentrations

Heavily-doped Zn2SiO4:Mn2+ phosphors showed a strong 422 nm photoluminescence excitation from T-4(1) -> (6)A(1) forbidden transitions of Mn2+ ions and an intensive 530 nm peak emission from T-4(1) -> (6)A(1) forbidden transitions with excellent thermal stability (90% @ 200 degrees C). The photoluminescence enhancement under 422 nm excitation was explained in terms of the relaxation of selection rule on the forbidden intratransitions of Mn2+ ions. It is attributed to the increased Mn2+-O2- intermixing supported by electron spin resonance signal. Finally, the heavily-doped Zn2SiO4:Mn2+ phosphor was applied to white-light-emitting diode as a blue-to-green color conversion phosphor. (C) 2015 Elsevier B.V. All rights reserved.