Generation of Broadband Emission by Incorporating N^3- into Ca₃Sc₂Si₃O₁₂:Ce³⁺ Garnet for High Rendering White LEDs

Authors

Yongfu Liu, Chinese Academy of SciencesFollow
Xia Zhang, Chinese Academy of SciencesFollow
Zhendong Hao, Chinese Academy of SciencesFollow
Xiao-Jun Wang, Georgia Southern UniversityFollow
Jiahua Zhang, Chinese Academy of SciencesFollow

Document Type

Article

Publication Date

2011

Publication Title

Journal of Materials Chemistry

DOI

10.1039/C0JM04404K

Abstract

Adding Si₃N₄ into green emitting Ca₃Sc₂Si₃O₁₂:Ce³⁺ garnet phosphor generates an additionally red emission band peaking around 610 nm that are assigned to Ce³⁺ ions having N³⁻ in their local coordination. The excitation spectrum of the red band consists of not only a distinct band at 510 nm of itself but also an intense blue band at 450 nm that belongs to the typical Ce³⁺ ions with green emission, indicating a notable energy transfer from the green emitting Ce³⁺ ions to the red ones. The energy transfer significantly enables the achievement of a broad emission spectrum covering a red and green spectral region suitable for generating white light upon a blue light-emitting diode (LED) excitation. The decay patterns of the red and green fluorescence are discussed in relation to the effect of energy transfer. A white LED with high color rendering of 86 and low correlated color temperature of 4700 K is fabricated using the present single garnet phosphor.

Recommended Citation

Liu, Yongfu, Xia Zhang, Zhendong Hao, Xiao-Jun Wang, Jiahua Zhang. 2011. "Generation of Broadband Emission by Incorporating N^3- into Ca₃Sc₂Si₃O₁₂:Ce³⁺ Garnet for High Rendering White LEDs." Journal of Materials Chemistry, 21 (17): 6354-6358: Royal Society of Chemistry. doi: 10.1039/C0JM04404K
https://digitalcommons.georgiasouthern.edu/physics-facpubs/61

Copyright

Royal Society of Chemistry Copyright