Mg3.5Ge1.25O6:Mn4+ was synthesized by a solid-state reaction and its photoluminescence characteristics were investigated. The synthesized phosphor showed a narrow emission band between 600 and 700 nm with two clear peaks at 632 and 660 nm and two obscure peaks at 626 and 653 nm due to the 2E→4A2 transition of Mn4+ (λex=405 nm). Red light-emitting diodes (LEDs) were fabricated through the integration of an InGaN UV chip (λem=405 nm) and Mg3.5Ge1.25O 6:Mn4+ phosphor in a single package. Red LEDs showed CIE chromaticity with values of x=0.32 and y=0.10 and the color temperature of 4900 K.
Bibliographical noteFunding Information:
This work is supported by Korea Research Council for Industrial Science and Technology ( SI-1308 ) and the Korean Ministry of Science and Technology ( KK-1307-B6 ). This work is also supported by the Pioneer Research Center Program through the National Research Foundation of Korea funded by the Ministry of Science, ICT & Future Planning ( 2013009204 ).
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering