Advanced SearchSearch Tips
Optical Properties of UV LEDs depending on Encapsulate Method using Silicone Encapsulants with Different Refractive Indices
facebook(new window)  Pirnt(new window) E-mail(new window) Excel Download
 Title & Authors
Optical Properties of UV LEDs depending on Encapsulate Method using Silicone Encapsulants with Different Refractive Indices
Kim, Wan-Ho; Koo, Dai-Hyoung; Noh, Ju-Hyun; Lee, Kyung-Won; Jeon, Sie-Wook; Kim, Jae-Pil; Yeo, In-Seon;
  PDF(new window)
Optical characteristics including the radiant flux and viewing angle of UV LEDs were investigated according to both silicone encapsulants with different refractive indexes and lens shapes. Lead frame was fabricated using the enhanced heat dissipation characteristics with a heat slug structure and the reflector based on EMC(Epoxy Mold Compound) material. Four types of lens shapes were designed and their optical characteristics depending on the refractive index of silicone encapsulants were evaluated. The maximum radiant flux can be achieved when the height of lens are 1.32mm and 1.08mm for silicone encapsulants with low and high refractive indexes, respectively. Depending on the encapsulating method, the viewing angle changes from to for low refractive index and from to for high refractive index. As a result, it is found that the optical characteristics of UV LEDs can be controled through both encapsulating method and the refractive index of encapsulants.
UV LED;Silicone;Refractive index;Radiant flux;Viewing Angle;
 Cited by
Z. Liu. S. Liu, Kai Wang, and X. Luo, "Status and prospects for phosphor-based white LED packaging," Front. Optoelectron. China, Vol. 2, No. 2, pp. 119-140, 2009. crossref(new window)

D. A. Steigerwald, J. C. Bhat, D. Collins, R. M. Fletcher, M. O. Holcomb, M. J. Ludowise, P. S. Martin, and S. L. Rudaz, "Illumination With Solid State Lighting Technology," IEEE J. Sel. Topics Quantum Electron., Vol. 8, No. 2, pp. 310-320, March/April 2002. crossref(new window)

Jae-Bum Kim, Seong-Ran Jeon, Jae-Gwang Han, Sung-Ku Knag, Chang-Sub Chung, "Design and Evaluation of an Optical Curing System using UV Light-emitting Diodes" The Korean Physical Society, Vol. 60, No. 3, pp. 300-308, 2010, 3.

Seong-Mo Ku, Jong-min lm, Chin-woo Yi, "Measurement of UV radiation of LED lighting", JIEIE, vol. 25, pp. 7-14, 2011.

E. F. Schubert, Light Emitting Diode, 2nd ed. (Cambridge University Press, Cambridge) pp. 195. 2006.

Heyong-Jin Kim.Jin-Yeol Yoo.Young-Rae Kang.Jae-Pil Kim.Joon-Seop Kwak, "A study of light output characteristics with various refractive indices and geometrical structures of the GaN based light-emitting device encapsulants", JIEIE, Vol. 26, No. 7, p.1-8, 2012, 6.