|Title:||Color-tunable, single phased MgY 4Si 3O 13: Ce 3+, Mn 2+ phosphors with efficient energy transfer for white-light-emitting diodes||Authors:||Hsu C.-H.
|Issue Date:||2012||Journal Volume:||159||Journal Issue:||5||Start page/Pages:||J193-J199||Source:||Journal of the Electrochemical Society||Abstract:||
A series of Ce 3+/Mn 2+-coactivated MgY 4Si 3O 13 phosphors with oxyapatite nature have been prepared via high temperature solid state reaction process and their structural and luminescence property was thoroughly investigated. On examining the Mn 2+ concentration-dependent photoluminescence properties, we found that the increment of Mn 2+ concentration would lead to a systematic decrease of Ce 3+ emission due to the efficient energy transfer from Ce 3+ to Mn 2+, which occurs because of the spectral overlap between the emission band of Ce 3+ and the excitation band of Mn 2+. The resonant energy transfer from Ce 3+ to Mn 2+ via a dipole-quadrupole mechanism was supported by decay lifetime data and the critical distance (R C) of the energy transfer was calculated to be 14.13 ?. The color-tunable emission in Ce 3+/Mn 2+ codoped system as a function of Mn 2+ concentration can be realized by continuous shifting of the emission colors from blue to white and eventually to orange red region. Based on the results in this study, MgY 4Si 3O 13:Ce 3+,Mn 2+ phosphors are considered efficient phosphors with excellent color tunability for white UV-LEDs. ? 2012 The Electrochemical Society.
|Appears in Collections:||化學工程學系|
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