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Muramoto Y.,Nitride Semiconductors Co. | Kimura M.,Nitride Semiconductors Co. | Nouda S.,Nitride Semiconductors Co.
2015 IEEE Summer Topicals Meeting Series, SUM 2015 | Year: 2015

Ultraviolet light-emitting diodes (UV-LEDs) have started replacing ultraviolet lamps. The power of UV-LEDs has greatly improved and the cost has decreased. In this paper, we attempt to understand the technologies and potential of UV-LEDs. © 2015 IEEE. Source


Muramoto Y.,Nitride Semiconductors Co. | Kimura M.,Nitride Semiconductors Co. | Nouda S.,Nitride Semiconductors Co.
Electronics, Communications and Networks IV - Proceedings of the 4th International Conference on Electronics, Communications and Networks, CECNet2014 | Year: 2015

White Light-Emitting Diodes (LEDs), which use blue LEDs in combination with yellow phosphors are popular. But it has poor color rendering properties. A white LED using Ultraviolet(UV)-LED in Red, Green, and Blue (RGB) phosphors has excellent color rendering properties, but its light-emitting efficiency was low. In this paper, we describe further improvements on the color rendering and light-emitting efficiency of the UV-RGB-type white LED with little variation in color, and its efficiency improved to 100lm/W. © 2015 Taylor & Francis Group, London. Source


Muramoto Y.,Nitride Semiconductors Co. | Kimura M.,Nitride Semiconductors Co. | Nouda S.,Nitride Semiconductors Co.
Semiconductor Science and Technology | Year: 2014

Ultraviolet light-emitting diodes (UV-LEDs) have started replacing UV lamps. The power per LED of high-power LED products has reached 12W (14 A), which is 100times the values observed ten years ago. In addition, the cost of these high-power LEDs has been decreasing. In this study, we attempt to understand the technologies and potential of UV-LEDs. © 2014 IOP Publishing Ltd. Source


Muramoto Y.,Nitride Semiconductors Co. | Kimura M.,Nitride Semiconductors Co. | Dempo A.,Nitride Semiconductors Co. | Nouda S.,Nitride Semiconductors Co. | Fukawa Y.,Nitride Semiconductors Co.
48th Annual SID Symposium, Seminar, and Exhibition 2010, Display Week 2010 | Year: 2010

While the solid state lighting has already become a reality using blue LEDs with yellow phosphor (B+Y), progress development and the luminous efficacy of ultraviolet light emitting diode (UV-LED) improvements have followed. Soon white emission as the product of nearUV (nUV)-LEDs exciting red, green and blue (RGB) phosphors will also contribute to the solid state lighting revolution. We present the technologies and the possibility of using nUV+RGB white LEDs for the application to LCD backlighting. Source


Muramoto Y.,Nitride Semiconductors Co. | Kimura M.,Nitride Semiconductors Co. | Dempo A.,Nitride Semiconductors Co. | Nouda S.,Nitride Semiconductors Co. | And 2 more authors.
Journal of the Society for Information Display | Year: 2011

Progress in the development of blue light-emitting diodes and yellow phosphor has led to the realization of solid-state lighting. The development was followed by improvement in the luminous efficacy of ultraviolet light-emitting diodes (UV-LEDs). By using near-UV-LEDs (n-UV-LEDs) excited light for red, green, and blue (RGB) phosphors, a new type of solid-state lighting was realized. An innovative method for increasing the efficiency of LEDs by using a silicon nitride layer as the active layer and piling them up to a nano-sized level with nano-sized holes has been developed. © Copyright 2011 Society for Information Display. Source

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