光子上转换
半导体
辐射传输
波长
吸收(声学)
光电子学
辐射冷却
材料科学
能量转换效率
光子
带隙
能量转换
光子能量
自发辐射
辐射能
光学
原子物理学
发光
物理
激光器
辐射
热力学
作者
V. K. Malyutenko,V. V. Bogatyrenko,O. Yu. Malyutenko
摘要
We report on the radiative cooling of an indirect band gap semiconductor through its absorption of interband incoherent light and subsequent spontaneous emission of multiple longer-wavelength photons (optical down-conversion) in conditions when the energy deficit of the process is covered by the thermal energy. The 10×10×5 mm3 Si slab kept at 473 K in an evacuated up to 10−3 torr chamber was cooled by 3.8 K when pumped with light of 1.06 μm wavelength. First-principles estimates and several advantages of the down-conversion approach over possible cooling of direct band gap semiconductors through the optical upconversion and negative luminescence are discussed.
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