Control of spectral emittance using a rare‐earth oxide film coated on a ceramic plate

Abstract

The spectral emission of a ceramic plate coated with a rare-earth oxide thin film was investigated for thermophotovoltaic (TPV) applications using a one-dimensional radiative transfer analysis. The selective emitter has emission bands at wavelengths around 1 and 1.5 µm due to erbium. In the temperature range between 1400 and 1500 K, the radiant energy within these bands is remarkably large, because the Planck distribution has a peak at a wavelength of approximately 2 µm. In addition, the spectral response of a GaSb TPV cell has a peak at around 1.5 µm; therefore, the radiant energy of the emission bands is quite useful for the TPV generation of electricity. The total spectral efficiency for both the 1 µm and 1.5 µm bands reaches a maximum value of 0.295 for a film thickness between 0.2 and 0.3 mm.

Near Infrared Radiation from Heated Nanostructured Tungsten

“…At present, the development of an absorber and emitter that can effectively convert the solar light to a particular NIR radiation is an important research issue. [11][12][13] The reduction in the optical reflectance indicates the increase in the emittance of radiation, which is an important characteristic for emitters. In this paper, to explore the possibility that the nanostructured tungsten can used for the emitter, the emittance of radiation from tungsten is measured during the formation of the nanostructure on the surface.…”