| CPC G06F 30/20 (2020.01) [H10N 10/855 (2023.02); G06F 2111/10 (2020.01); G06F 2119/08 (2020.01)] | 10 Claims |

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1. A spectrally selective emitter, comprising a first layer, a second layer and a third layer arranged in sequence, wherein the first layer and the third layer are both a hafnium oxide layer, and the second layer is a hafnium oxide layer in which a plurality of erbium oxide nanoparticles is distributed.
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