Journal
JOURNAL OF MATERIALS CHEMISTRY C
Volume 2, Issue 36, Pages 7513-7522Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4tc00945b
Keywords
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Funding
- National Research Foundation of Korea (NRF) - Korea government (MSIP Ministry of Science, ICT&Future Planning) [2011-0017449, ERC-R11-2005-048-00000-0, NRF-C1AAA001-2009-0092938]
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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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