Photonics Research, 2019, 7 (8): 08000B55, Published Online: Jul. 29, 2019
Review of encapsulation materials for AlGaN-based deep-ultraviolet light-emitting diodes Download: 1064次
Abstract
This paper reviews and introduces the techniques for boosting the light-extraction efficiency (LEE) of AlGaN-based deep-ultraviolet ( ) light-emitting diodes (LEDs) on the basis of the discussion of their molecular structures and optical characteristics, focusing on organoencapsulation materials. Comparisons of various fluororesins, silicone resin, and nonorgano materials are described. The only usable organomaterial for encapsulating DUV-LEDs is currently considered to be polymerized perfluoro(4-vinyloxy-1-butene) (p-BVE) terminated with a end group. By forming hemispherical lenses on DUV-LED dies using p-BVE having a end group with a refractive index of about 1.35, the LEE was improved by 1.5-fold, demonstrating a cost-feasible packaging technique.
Yosuke Nagasawa, Akira Hirano. Review of encapsulation materials for AlGaN-based deep-ultraviolet light-emitting diodes[J]. Photonics Research, 2019, 7(8): 08000B55.