A Methodological Study of the Best Solution for Generating White Light Using Nitride-Based Light-Emitting Diodes(Lasers, Quantum Electronics)

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概要

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• In search of suitable white-LED for general illumination, we fabricated various types of white-LEDs using different methods. As the first method, we used the multichip method in which multiple emitters were mounted in one package. This type showed a good general color-rendering index (Ra)=90 by the optimizing the emission wavelength of each LED chip. However, the electric driving circuitry was too complex for use in general illumination. Secondly, we used a monolithic white-LED by using the multicolor emitting multiple-quantum well (MQW) for the active layers, which consisted of quantum wells (QWs) with different In compositions. A high Ra=80.1 was obtained in the three-color-emitting white-LED but the luminous efficacy (η_L) was only 8.11lm/W. As the third method, we used the color conversion method using phosphors. We fabricated a white-LED which consisted of a near-UV-LED chip and blue/yellow phosphors in order to improve the luminous efficacy of the white-LED under high forward-bias current. At 100mA, the luminous flux (I_L) was estimated to be 7.6lm. However, this white-LED degraded quickly, because the epoxy resin used for package was the general purpose one and deteriorated under the UV-light from the n-UV-LED. Next, we improved the Ra and η_L of a traditional white-LED which consisted of blue-LED chip and yellow phosphor. In order to improve the Ra, we added a newly developed red phosphor. We obtained a Ra=87.7 at low-color-temperature. Then, in order to improve the efficiency of the white-LED, we improved the extraction efficiency (η_<EX>) of the blue-LED by using a patterned sapphire substrate and a high reflection Rh-mesh-patterned p-electrode. Then, we obtained a 62.01m/W at 20mA. As a result, we concluded that the color conversion method of using a blue-LED for general illumination has advantages in efficiency, color-rendering, cost and lifetime. It also has simpler electric driving circuitry.

• 社団法人電子情報通信学会の論文
• 2005-09-01

著者

• Mukai T

  Nitride Semiconductor Research Laboratory Opto-electronics Products Division Nichia Corp.

• MUKAI Takashi

  Department of Research and Development, Nichia Chemical Industries Ltd.

• Mukai Takashi

  Kyoto Univ. Kyoto Jpn

• Takahashi Masayoshi

  Nitride Semiconductor Research Laboratory Nichia Corporation

• Mukai Takashi

  Nitride Semiconductor Research Laboratory Nichia Corporation

• Mukai Takashi

  Department Of Research And Development; Nichia Chemical Industries Ltd.

• NARUKAWA Yukio

  Department of Electronic Science and Engineering, Kyoto University

• Narukawa Yukio

  Kyoto Univ. Kyoto Jpn

• Narukawa Yukio

  Nitride Semiconductor Research Laboratory Nichia Corporation

• Narukawa Yukio

  Department Of Electronic Science And Engineering Kyoto University

• Mukai Takashi

  Nitride Semiconductor Research Laboratory Opto-electronics Products Division Nichia Corp.

• Mukai Takashi

  Nichia Corp. Tokushima Jpn

• Matsushita Toshio

  Department Of Research And Development Nichia Chemical Industries Ltd

• Mukai Takashi

  Department Of Nitride Semiconductor Research Laboratory Optoelectronics Products Division Nichia Cor

• Yamada Motokazu

  Department of Research and Development; Nichia Chemical Industries Ltd.

• Yamada Motokazu

  Department Of Nitride Semiconductor Research Laboratory Optoelectronics Products Division Nichia Cor

• TAMAKI Hiroto

  LED Back-End Engineering Department, Optoelectronics Products Division, Nichia Corporation

• MURAZAKI Yoshinori

  LED Back-End Engineering Department, Optoelectronics Products Division, Nichia Corporation

• Tamaki Hiroto

  Led Back-end Engineering Department Optoelectronics Products Division Nichia Corporation

• Murazaki Yoshinori

  Led Back-end Engineering Department Optoelectronics Products Division Nichia Corporation

関連論文

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• Enhancement of Blue Emission from Mg-Doped GaN Using Remote Plasma Containing Atomic Hydrogen
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