Recent progress of high efficiency white LEDs
Recent progress of high efficiency white LEDs
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DOI：
10.1002/pssa.200674782
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发表时间：
2007-06
期刊：
影响因子：
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通讯作者：
Y. Narukawa;Junya Narita;Takahiko Sakamoto;T. Yamada;H. Narimatsu;M. Sano;T. Mukai
中科院分区：
文献类型：
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作者：
Y. Narukawa;Junya Narita;Takahiko Sakamoto;T. Yamada;H. Narimatsu;M. Sano;T. Mukai
我们制造了三种类型的白光发光二极管 (LED)。第一种是白光 LED，其一般显色指数 (Ra) 高达 97，CRI-No.1。 9 / 96。CRI-No。 9表示红色区域的色彩再现。这些值高于三基色荧光灯的值（Ra = 85，CRI-No. 9 = 8）。第二种是由小尺寸高效蓝光LED芯片制成的高效白光LED。在正向偏置电流为 20 mA 时，小尺寸蓝光 LED 的输出功率 (Po)、外量子效率 (ηex) 和电光转换效率 (WPE) 分别为 35.0 mW、63.3% 和 56.3%。第二白光LED的光通量(Φ)、发光效率(ηL)和WPE分别为8.6lm、138lm/W和41.7％。发光效率比三基色荧光灯（90 lm/W）高1.5倍。第三种是由较大尺寸的蓝光 LED 芯片制成的高功率白光 LED。 Po、ηex 和 W.P.E。 350 mA 时分别为 458 mW、47.2% 和 39.7%。第三个白光 LED 在 350 mA 电流下的 Φ、ηL 和 WPE 分别为 106 lm、91.7 lm/W 和 27.7%。此外，在1A和2A下分别获得247lm和402lm的Φ。 2 A 时的 Φ 相当于 30 W 白炽灯的总光通量。 （© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA，魏因海姆）
We fabricated three types of white light emitting diodes (LEDs). The first is the white LED, which has a high general color rendering index (Ra) of 97 and CRI‐No. 9 of 96. The CRI‐No. 9 denotes the color reproduction in the red region. These values are higher than those of a tri‐phosphor fluorescent lamp (Ra = 85 and CRI‐No. 9 = 8). The second is the high efficiency white LED fabricated from the small‐size high efficiency blue LED chip. The output power (Po), the external quantum efficiency (ηex) and wall‐plug efficiency (WPE) of the small‐size blue LED were 35.0 mW, 63.3% and 56.3%, respectively, at a forward‐bias current of 20 mA. The luminous flux (Φ), luminous efficiency (ηL) and WPE of the second white LED are 8.6 lm, 138 lm/W and 41.7%, respectively. The luminous efficiency is 1.5 times greater than that of a tri‐phosphor fluorescent lamp (90 lm/W). The third is the high power white LED fabricated from the larger‐size blue LED chip. Po, ηex and W.P.E. are 458 mW, 47.2% and 39.7%, respectively, at 350 mA. Φ, ηL and WPE of the third white LED are 106 lm, 91.7 lm/W and 27.7% at 350 mA, respectively. Moreover, Φ of 247 lm and 402 lm at 1 A and 2 A are obtained, respectively. Φ at 2 A is equivalent to the total flux of a 30 W incandescent lamp. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)