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http://dx.doi.org/10.5762/KAIS.2014.15.8.5195

Application of a Flashlight system for White LEDs Manufactured using a Reproduction Phosphor  

Ryu, Jang-Ryeol (Division of Electrical, Electronic & Control Engineering Kongju National University)
Publication Information
Journal of the Korea Academia-Industrial cooperation Society / v.15, no.8, 2014 , pp. 5195-5200 More about this Journal
Abstract
White LEDs are expected to be applied widely as a lighting system. To make white LED chips, one requires a mixture with silicon and a phosphor coating on a LED blue chip. The process of preparing a mixture with silicon using phosphor involves the use of discarded phosphor in the chip process. Reducing the costs of chip production depends on many factors, such as the mixture errors, exposure over time of silicon, and changes in the characteristics of blue chip. This paper reports the characteristics of a white LED chip manufactured through a reproduction process of derelict phosphor. This method was applicable to a real LED flashlight. A derelict phosphor chip showed similar results to a normal white chip for the degradation of cd 3.2[Cd] and 3.6[Cd], color temperature, 57[K] and 58[K], and maximum white wavelength 444.3[nm] and 449.8[nm]. These results are expected to make ea great contribution to cost reduction.
Keywords
blue chip; cost reduction; lighting system; reproduction phosphor; white LED;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
1 J. W. Park et all., "Comparison of radiant heat characteristics for Design of LED lighting system", KIIEE Spring Conf., May, 2009.
2 T.Egawa, B.Zhang, and H.Ishikawa, "High Performance of InGaN LEDs on (111) Silicon Substrate grown by MOCVD", IEEE ELECTRON DEVICE LETTERS, Vol. 26, No. 3, pp. 69-171, March, 2005. DOI: http://dx.doi.org/10.1109/LED.2004.842642   DOI   ScienceOn
3 H. G. kimet al, "Improved GaN-Based LED Light Extraction Efficiencies via Selective MOCVD Using Peripheral Microhole Arrays", IEEE PHOTONIC TECHNOLOGY LETTERS, Vol. 20, No. 15, pp.1284-1286, Aug., 2008. DOI: http://dx.doi.org/10.1109/LPT.2008.926870   DOI   ScienceOn
4 K. Y. Kim, W. K. Ham, " Technology Trends for radiant heat high power LED lighting system", KIIEE Spring Conference, May, 2009.
5 J.W.Park et all,"Development of LED standard product for PAR38 type standardization", KIIEE Spring Conference, pp.25-28, OCT., 2008.
6 K. H. Kim et all, "Design of LED lighting product using Elevator as possible color temperature control", KIIEE Spring Conference, pp.71-76, Nov., 2007.
7 J. S. Kim, J. R. Ryu, "Process Development for Reproduction of derelict Phosphors in the Manufacture of White LED Chip", KIIT, Vol.11, No.5, pp.1-6, June, 2013.
8 S. H. Whang et all, "A study on Optimized radiant heat design for 10W LED lighting system", KAIS, Vol.11, No.7, pp.2317-2322, 2010.