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  • 1
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    Rare earth garnet selective emitter (1994)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Thin film Ho-YAG and Er-YAG emitters with a platinum substrate exhibit high spectral emittance in the emission band (epsilon(sub lambda) approximately equal to 0.74, ((4)l(sub 15/2)) - ( (4)l(sub13/2)), for Er-YAG and epsilon(sub lambda) approximately equal to 0.65, ((5)l(sub 7))-((5)l(sub 8)) for Ho-YAG) at excellent candidates for high efficiency selective emitters in the thermophotovoltaics (TPV) systems operating at moderate temperatures (1200-1500K). Spectral emittance measurements of the thin films were made (1.2 less than lambda less than 3.0 microns) and compared to the theoretical emittances calculated using measured values of the spectral extinction coefficient. In this paper we present the results for a new class of rare earth ion selective emitters. These emitters are thin sections (less than 1 mm) of yttrium aluminum garnet (YAG) single crystal with a rare earth substitutional impurity. This paper presents normal spectral emittance, epsilon(sub lambda), measurements of holmium (Ho), and erbium (Er) doped YAG thin film selective emitters at 1500 K, and compares those results with the theoretical spectral emittance.
    Keywords: SOLID-STATE PHYSICS
    Type: Proceedings of the 13th Space Photovoltaic Research and Technology Conference (SPRAT 13); p 335-339
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Electrically conducting polymers for aerospace applications (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Current research on electrically conducting polymers from 1974 to the present is reviewed focusing on the development of materials for aeronautic and space applications. Problems discussed include extended pi-systems, pyrolytic polymers, charge-transfer systems, conductive matrix resins for composite materials, and prospects for the use of conducting polymers in space photovoltaics.
    Keywords: SOLID-STATE PHYSICS
    Type: AIAA PAPER 91-3432
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Radiative Performance of Rare Earth Garnet Thin Film Selective Emitters (1994)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: In this paper we present the first emitter efficiency results for the thin film 40 percent Er-1.5 percent Ho YAG (Yttrium Aluminum Garnet, Y3Al5O12) and 25 percent Ho YAG selective emitter at 1500 K with a platinum substrate. Spectral emittance and emissive power measurements were made (1.2 less than lambda less than 3.2 microns). Emitter efficiency and power density are significantly improved with the addition of multiple rare earth dopants. Predicted efficiency results are presented for an optimized (equal power density in the Er, (4)I(sub 15/2)-(4)I(sub 13/2) at 1.5 microns, and Ho, (5)I(sub 7)-(5)I(sub 8) at 2.0 micron emission bands) Er-Ho YAG thin film selective emitter.
    Keywords: SOLID-STATE PHYSICS
    Type: NASA-TM-106722 , E-9088 , NAS 1.15:106722 , Conference on Thermophotovoltaic Generation of Electricity; Jul 24, 1994 - Jul 26, 1994; Copper Mountain, CO; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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