NDLI: 2D TiO2 photonic crystal-assisted Y3Al5O12:Ce ceramic-plate phosphor and free-standing red film phosphor for white LEDs

Content Provider	IEEE Xplore Digital Library
Author	Yun Jae Eo Hoo Keun Park Young Rag Do
Copyright Year	2015
Description	Author affiliation: Dept. of Chem., Kookmin Univ., Seoul, South Korea (Yun Jae Eo; Hoo Keun Park; Young Rag Do)
Abstract	In this paper, the optical properties of a two-dimensional (2D) $TiO_{2}$ nanobowl photonic crystal layer (PCL)-assisted $Y_{3}Al_{5}O_{12}:Ce$ (YAG:Ce) yellow ceramic-plate phosphor (CPP) and a free-standing $K_{2}SiF_{6}:Mn$ (KSF:Mn) red film phosphor are introduced. By placing 2D $TiO_{2}$ PCL-assisted YAG:Ce CPP onto a blue emissive light-emitting diode (LED) cup, we achieved an increase in the luminous efficacy of 1.53 times compared to when flat YAG:Ce CPP was placed onto the cup. Despite the increased luminous efficacy, the low color rendering index (CRI) was maintained. In order to enhance the CRI, we applied various concentrations of free-standing KSF:Mn red film phosphor between 2D PCL-assisted YAG:Ce CPP or flat YAG:Ce CPP with a blue LED cup. The optical properties were measured by means of the electroluminescence (EL) by applying a constant current (350 mA) to the LED chip. As a result, we obtained a high CRI (91), a low correlated color temperature (CCT, 2580 K), and good luminous efficacy (75.0 lm/W) by applying free-standing red phosphor film with a concentration of 50 wt% to a 2D PCL-assisted YAG:Ce CPP-based LED.
Starting Page	389
Ending Page	392
File Size	1114261
Page Count	4
File Format	PDF
e-ISBN	9781467381567
DOI	10.1109/NANO.2015.7389008
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-07-27
Publisher Place	Italy
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Phosphors Light emitting diodes Color Resins Fabrication Optical films phosphor-converted LED YAG:Ce CPP photonic crystal K2SiF6:Mn
Content Type	Text
Resource Type	Article

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