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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Xiang Lei Huai Zheng Xing Guo Jingcao Chu Ying Zhou Sheng Liu |
| Copyright Year | 2015 |
| Description | Author affiliation: China-EU Inst. for Clean & Renewable Energy, Huazhong Univ. of Sci. & Technol., Wuhan, China (Ying Zhou) || Sch. of Mech. Sci. & Eng., Huazhong Univ. of Sci. & Technol., Wuhan, China (Xiang Lei; Xing Guo; Jingcao Chu) || Sch. of Power & Mech. Eng., Wuhan Univ., Wuhan, China (Huai Zheng; Sheng Liu) |
| Abstract | Angular color uniformity (ACU) is an important optical parameter for phosphor-converted white light-emitting diodes (LEDs). The phosphor layer geometry usually presents the spherical-cap shape by the conventional dispensing coating method, thus yellow ring phenomenon appears in the radiation pattern and leads to poor ACU. In this paper, a kind of cone-type phosphor layer geometry was proposed to enhance the ACU of white LEDs. Optical simulations were performed by the Monte Carlo ray-tracing method. Results show that the proposed cone-type phosphor layer geometry has significant positive effect on enhancing the ACU of white LEDs. Compared to the conventional phosphor layer geometry of spherical cap with the same volume, the ACU is increased by more than 19% by the cone-type phosphor layer geometry. With the same correlated color temperature (CCT) and phosphor concentration, the ACU is increased by more than 20% and the phosphor layer volume is reduced by more than 4.5% to save material cost. |
| Starting Page | 884 |
| Ending Page | 887 |
| File Size | 2445138 |
| Page Count | 4 |
| File Format | |
| e-ISBN | 9781467379991 |
| DOI | 10.1109/ICEPT.2015.7236721 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2015-08-11 |
| Publisher Place | China |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Phosphors Light emitting diodes Geometry Color Coatings Packaging Substrates cone-type white LEDs phosphor angular color uniformity optical simulation |
| Content Type | Text |
| Resource Type | Article |
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