Effective heat dissipation from color-converting plates in high-power white light emitting diodes by transparent graphene wrapping
- Authors
- Kim, Eden; Shim, Hyeon Woo; Unithrattil, Sanjith; Kim, Yoon Hwa; Choi, Hojin; Ahn, Ki-Jin; Kwak, Joon Seop; Kim, Sungmin; Yoon, Hyeonseok; Im, Won Bin
- Issue Date
- Jan-2016
- Publisher
- AMER CHEMICAL SOC
- Keywords
- LEDs; graphene; heat dissipation; cellular automata
- Citation
- ACS NANO, v.10, no.1, pp.238 - 245
- Indexed
- SCIE
SCOPUS
- Journal Title
- ACS NANO
- Volume
- 10
- Number
- 1
- Start Page
- 238
- End Page
- 245
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/155276
- DOI
- 10.1021/acsnano.5b06734
- ISSN
- 1936-0851
- Abstract
- We have developed a hybrid phosphor-in-glass plate (PGP) for application in a remote phosphor configuration of high-power white light emitting diodes (WLEDs), in which single-layer graphene was used to modulate the thermal characteristics of the PGP. The degradation of luminescence in the PGP following an increase in temperature could be prevented by applying single-layer graphene. First, it was observed that the emission intensity of the PGP was enhanced by about 20% with graphene wrapping. Notably, the surface temperature of the graphene-wrapped PGP (G-PGP) was found to be higher than that of the bare PGP, implying that the graphene layer effectively acted as a heat dissipation medium on the PGP surface to reduce the thermal quenching of the constituent phosphors. Moreover, these experimental observations were clearly verified through a two-dimensional cellular automata simulation technique and the underlying mechanisms were analyzed. As a result, the proposed G-PGP was found to be efficient in maintaining the luminescence properties of the WLED, and is a promising development in high power WLED applications. This research could be further extended to generate a new class of optical or optoelectronic materials with possible uses in a variety of applications.
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