In this study, we proposed a bell shape phosphor layer geometry and the corresponding dual-step phosphor coating method for enhancing the angular color uniformity (ACU) of phosphor-converted white light-emitting diodes (pcLEDs). Numerical simulation based on Volume of Fluid (VOF) model was applied to predict phosphor geometries. Based on the simulated results, experiments were conducted to realize the phosphor geometries. The simulated results show that the VOF model can predict the phosphor geometries with an acceptable geometric deviation within 5%. The experimental results show that compared with the spherical cap phosphor layer geometry, the bell shape geometry can achieve better ACU performance, an optimal bell phosphor layer geometry with equal coating volume above and around the LED chip was achieved, for the corrected color temperature (CCT) of 4000 K, the angular CCT deviation of the optimal geometry is 62 K, while it is 382 K for the spherical cap geometry.
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ASME 2017 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems collocated with the ASME 2017 Conference on Information Storage and Processing Systems
August 29–September 1, 2017
San Francisco, California, USA
Conference Sponsors:
- Electronic and Photonic Packaging Division
ISBN:
978-0-7918-5809-7
PROCEEDINGS PAPER
Color Uniformity Enhancement of White Light-Emitting Diodes With Novel Bell Shape Phosphor Layer
Xingjian Yu
,
Xingjian Yu
Huazhong University of Science and Technology, Wuhan, China
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Weicheng Shu
,
Weicheng Shu
Huazhong University of Science and Technology, Wuhan, China
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Bofeng Shang
,
Bofeng Shang
Huazhong University of Science and Technology, Wuhan, China
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Bin Xie
,
Bin Xie
Huazhong University of Science and Technology, Wuhan, China
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Yanhua Cheng
,
Yanhua Cheng
Huazhong University of Science and Technology, Wuhan, China
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Xiaobing Luo
Xiaobing Luo
Huazhong University of Science and Technology, Wuhan, China
Search for other works by this author on:
Xingjian Yu
Huazhong University of Science and Technology, Wuhan, China
Weicheng Shu
Huazhong University of Science and Technology, Wuhan, China
Bofeng Shang
Huazhong University of Science and Technology, Wuhan, China
Bin Xie
Huazhong University of Science and Technology, Wuhan, China
Yanhua Cheng
Huazhong University of Science and Technology, Wuhan, China
Xiaobing Luo
Huazhong University of Science and Technology, Wuhan, China
Paper No:
IPACK2017-74195, V001T01A021; 5 pages
Published Online:
October 27, 2017
Citation
Yu, X, Shu, W, Shang, B, Xie, B, Cheng, Y, & Luo, X. "Color Uniformity Enhancement of White Light-Emitting Diodes With Novel Bell Shape Phosphor Layer." Proceedings of the ASME 2017 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems collocated with the ASME 2017 Conference on Information Storage and Processing Systems. ASME 2017 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems. San Francisco, California, USA. August 29–September 1, 2017. V001T01A021. ASME. https://doi.org/10.1115/IPACK2017-74195
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