Various nanofabrication approaches towards two-dimensional photonic crystals for ceramic plate phosphor-capped white light-emitting diodes
- Authors
- Yoon, Seong Woong; Park, Hoo Keun; Ko, Ki-Young; Ahn, Jinho; Do, Young Rag
- Issue Date
- Sep-2014
- Publisher
- ROYAL SOC CHEMISTRY
- Citation
- JOURNAL OF MATERIALS CHEMISTRY C, v.2, no.36, pp.7513 - 7522
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF MATERIALS CHEMISTRY C
- Volume
- 2
- Number
- 36
- Start Page
- 7513
- End Page
- 7522
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/159192
- DOI
- 10.1039/c4tc00945b
- ISSN
- 2050-7526
- Abstract
- This paper compares four different nanofabrication processes towards various two-dimensional (2D) photonic crystals (PCs) on a Y3Al5O12:Ce3+ (YAG:Ce) yellow ceramic plate phosphor (CPP) in order to enhance the luminous efficacy of YAG:Ce CPP-capped high-power white light-emitting diodes (LEDs). Compared with conventional flat CPP-capped LEDs, every type of 2D PC-assisted YAG CPP-capped LED improves the outcoupling efficiency, current and temperature stability, angular stability of color temperature, and thermal conductivity. Careful evaluation of the optical properties of 2D PC-assisted CPP LEDs shows that the highest luminous efficacy (similar to 142.7 lm W-1) is attained from a 2D TiO2 nanobowl PC-CPP LED sample, which was fabricated by nanosphere-based template growth and the dry etching process, and this evaluation indicates that 2D PC-assisted CPP-capped white LEDs will lead to further technological advancements for applications in highly efficient and thermally stable high-power white LEDs.
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