Radiative performance of rare earth garnet thin film selective emitters

Abstract

Abstract.In this paper we present the first emitter efficiency results for the thin film 40% Er-l.5% Ho YAG (Yttrium Aluminum Garnet, Y3AisO12) and 25% Ho YAG selective emitter at 1500 K with a platinum substrate. Spectral emittance and emissive power measurements were made (1.2 < ). < 3.2 lain). Emitter efficiency and power density are significantly improved with the addition of multiple rate earth dopants. Predicted efficiency results are presented for an optimized (equal power density in the Er, 'I15/2 -ai13/2 @ 1.5 I.tm, and Ho, 517 -sis @ 2.0 gm emission bands) Er-Ho YAG thin film selective emittez INTRODUCTION

Ultraefficient thermophotovoltaic power conversion by band-edge spectral filtering

“…1 A . The spectral filter has been implemented by photonic crystals (12–17), metamaterials (18–22), and rare-earth oxides (23, 24).…”