|
KMID : 1059520170610040163
|
|
Journal of the Korean Chemical Society
2017 Volume.61 No. 4 p.163 ~ p.167
|
|
|
Color Tuning of a Mn4+ Doped Phosphor : Sr1?xBaxGe4O9:Mn4+ 0.005 (0.00 ≤ x ≤ 1.00)
|
|
Park Woon-Bae
|
|
|
Abstract
|
|
|
|
Along with the progress of white LED technology, red phosphors have become increasingly important in industry and academia, and a more specific demand has steadily increased in the market. Red phosphors are used in high efficiency and high rendering LED lightings. However, using red phosphors with Eu2+ activators caused color rewarming and reduced emission intensity in white LED chips due to strong reabsorption in the green or yellow wavelength range caused by the 4f-5d transition. Mn4+ doped phosphors which have no such drawbacks and which can further improve the color rendering index (CRI) are now of great interest. However, Mn4+-doped phosphors have a disadvantage in that the emission wavelength is determined depending on the host due to the 2Eg→4A2 transition. In this study, the SrO-BaO-GeO2 solid-solution was selected, and Sr1?xBaxGe4O9:Mn4+ 0.005 (0 ≤ x ≤ 1) phosphors were synthesized and characterized. This led to a versatile color tuning in LED technology.
|
|
|
KEYWORD
|
|
|
LED, Phosphor, DFT, Band gap, XRD
|
|
|
FullTexts / Linksout information
|
|
|
|
|
|
Listed journal information
|
|
|
|