Light Outputs of LED with Various Refractive Indices and Geometrical Structures of Encapsulants

Title
Light Outputs of LED with Various Refractive Indices and Geometrical Structures of Encapsulants
Author(s)
박시현김경태[김경태]권호기[권호기]조경우[조경우]황정하[황정하]
Keywords
EXTRACTION EFFICIENCY; EMITTING-DIODES
Issue Date
201012
Publisher
KOREAN PHYSICAL SOC
Citation
JOURNAL OF THE KOREAN PHYSICAL SOCIETY, v.57, no.6, pp.1779 - 1783
Abstract
In this paper we present the results of experiments and simulations for the light output power from LEDs for various refractive indices and the geometrical structures of the LED encapsulants. InGaN-based LED chips were fabricated and were bonded in Ag reflector cups within polyphthalamide (PPA) chip carriers; then, encapsulants with various refractive indices and the geometrical structures were fabricated onto them by using a dispensing method. The light output power with the encapsulant was shown to increase with the refractive index of the encapsulant materials in the case of a spherical encapsulant while it decreased in the case of a fiat geometry encapsulant. We performed ray tracing simulations for the LED light output and confirmed that the simulation results were consistent with our experimentally measured results. In addition, the light output with the encapsulant rapidly increased with the sidewall angle of the chip carrier in the case of the flat encapsulant while it was not affected by the sidewall angle, remaining constant, in the case of the spherical geometry.
URI
http://hdl.handle.net/YU.REPOSITORY/23232http://dx.doi.org/10.3938/jkps.57.1779
ISSN
0374-4884
Appears in Collections:
공과대학 > 전자공학과 > Articles
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