Miniature the size of integrated sphere by three-lens design to measure the total light flux of wafer-level LED

Luan-Ying Chen; Kao-Der Chung; Chen-Chin Cheng

doi:10.1117/12.2191416

23 September 2015 Miniature the size of integrated sphere by three-lens design to measure the total light flux of wafer-level LED

Luan-Ying Chen, Kao-Der Chung, Chen-Chin Cheng

Author Affiliations +

Proceedings Volume 9626, Optical Systems Design 2015: Optical Design and Engineering VI; 962639 (2015) https://doi.org/10.1117/12.2191416
Event: SPIE Optical Systems Design, 2015, Jena, Germany

Abstract

The opening of the integrating sphere (IS) is limited by the port ratio, roughly 4% of the sphere surface area. Therefore, there exist a tradeoff between enlarging the opening to collect more radiance flux from the LED, and maintaining the port ratio when the sphere is miniaturized. A lenses group can be designed to narrow the spot size of LED in order to minimum the volume of IS. By adopting the simulating method systematically, the spot can be narrowed from 1.5mm to 0.283mm. The corresponding volume of IS can be reduced to more 50% in size. It is possible to achieve the multichannel measurement on the wafer-level. The novel IS combined with the designed lenses group may be useful to raise the speed of the measurement of LED in the future.

Citation Download Citation

Luan-Ying Chen, Kao-Der Chung, and Chen-Chin Cheng "Miniature the size of integrated sphere by three-lens design to measure the total light flux of wafer-level LED", Proc. SPIE 9626, Optical Systems Design 2015: Optical Design and Engineering VI, 962639 (23 September 2015); https://doi.org/10.1117/12.2191416

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