Efficient mid-infrared light output has been obtained by incorporating a W-superlattice into a cascaded mid-infrared LED structure and by thinning and roughening of the emission side of the structure. At cryogenic temperatures, a radiance of ∼13.4 W/cm²-sr is achieved. Compared to the best published InAs/GaSb mid-IR LED, the maximum radiance is improved by ∼2.0×, while the wallplug efficiency improvement at the maximum radiance is improved >10×. For room temperature measurements on an un-thinned 400 μm diameter diode, the radiance (light output power) for a quasi-continuous wave and 1% duty cycle were ∼ 0.48 W/cm²-sr (2.4 mW) and ∼1.35 W/cm²-sr (6.8 mW), respectively. When compared to previous room temperature 4.2 μm LEDs, at a 1% duty cycle, this LED has optical powers that are 3× brighter. When compared to thermal emitters used in gas sensors, in the quasi-continuous wave, this LED uses ∼100× less energy per measurement.

中文翻译：

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使用W超晶格和纹理表面的大功率中波红外LED

通过将W超晶格合并到级联的中红外LED结构中并通过使结构的发射面变薄和变粗糙，可以获得高效的中红外光输出。在低温下，辐射度约为13.4 W / cm ² -sr。与最佳发布的InAs / GaSb中红外LED相比，最大辐射度提高了约2.0倍，而在最大辐射度下的墙插效率提高了> 10倍。用于在未变薄400室温下测量 μ米直径二极管，的辐射（光输出功率），用于准连续波和1％的占空比为0.48〜W /厘米² -SR（2.4毫瓦）和~1.35W¯¯ / cm ² -sr（6.8 mW）。与之前的室温相比 4.2μm个LED，占空比为1％时，该LED的光功率提高了3倍。与气体传感器中使用的热发射器相比，在准连续波中，该LED每次测量可节省约100倍的能量。