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http://dx.doi.org/10.5012/jkcs.2017.61.4.163

Color Tuning of a Mn4+ Doped Phosphor : Sr1-xBaxGe4O9:MnMn4+0.005 (0.00 ≤ x ≤ 1.00)  

Park, Woon Bae (Faculty of Nanotechnology and Advanced Materials Engineering, Sejong University)
Publication Information
Journal of the Korean Chemical Society / v.61, no.4, 2017 , pp. 163-167 More about this Journal
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 $Eu^{2+}$ 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. $Mn^{4+}$ doped phosphors which have no such drawbacks and which can further improve the color rendering index (CRI) are now of great interest. However, $Mn^{4+}$-doped phosphors have a disadvantage in that the emission wavelength is determined depending on the host due to the $^2E_g{\rightarrow}^4A_2$ transition. In this study, the $SrO-BaO-GeO_2$ solid-solution was selected, and $Sr_{1-x}B_axGe_4O_9:Mn^{4+}{_{0.005}}$ ($0{\leq}x{\leq}1$) phosphors were synthesized and characterized. This led to a versatile color tuning in LED technology.
Keywords
LED; Phosphor; DFT; Band gap; XRD;
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