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Updated: Jun 11, 2026

Low-energy Cathodoluminescence for (Oxy)Nitride Phosphors
Published on: November 15, 2016
Full down-conversion of amber-emitting phosphor-converted light-emitting diodes with powder phosphors and a long-wave
Jeong Rok Oh1, Sang-Hwan Cho, Hoo Keun Park
1Department of Chemistry, Kookmin University, Seoul 136-702, Korea.
Abstract:
This paper reports the possibility of a facile optical structure to realize a highly efficient monochromatic amber-emitting light-emitting diode (LED) using a powder-based phosphor-converted LED combined with a long-wave pass filter (LWPF). The capping of a blue-reflecting and amber-passing LWPF enhances both the amber emission from the silicate amber phosphor layer and the color purity due to the blocking and recycling of the pumping blue light from the InGaN LED. The enhancement of the luminous efficacy of the amber pc-LED with a LWPF (phosphor concentration 20 wt%, 39.4 lm/W) is 34% over that of an amber pc-LED without a LWPF (phosphor concentration 55 wt%, 29.4 lm/W) at 100 mA and a high color purity (>96%) with Commission International d'Eclairage (CIE) color coordinates of x=0.57 and y=0.42.
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