Porosity optimization of rare-earth oxide emitters for thermophotovoltaics

Abstract

Porous rare-earth oxides are promising emitters for thermophotovoltaic generation because rare-earth ions exhibit narrow-band thermal emissions in a photovoltaic-convertible wavelength range and the pores scatter light of unwanted wavelengths. However, the effects of pores on the emitter performance have not been studied well due to the complexity. In this letter, we reveal the effects by analyzing the thermal emission spectra of garnet (Yb3Ga5O12) emitters by using a Kubelka-Munk-(KM) like two-flux model. The model incorporates the effects of pores as dependences on porosity of the absorption and scattering coefficients of the emitters. The absorption and scattering coefficients are determined uniquely by fitting the model to the experimental results with the help of the KM transform. We demonstrate that the emitter performance can be maximized by optimizing the porosity.

Analysis of the Rare Earth Mineral Resources Reserve System and Model Construction Based on Regional Development

“…At the same time, they also pointed out that there was still a big gap between the application level of rare earth elements in China and some foreign countries [ 19 ]. Shibuya et al elaborated the process and polishing mechanism of polishing powder, focused on the application fields of polishing powder, and looked forward to the future application of products [ 20 ]. Liu et al thought that the total amount of nonrenewable mineral resources in the crust is a fixed value, but the economically recoverable reserves change dynamically with time.…”

Deep red upconversion photoluminescence in Er3+‐doped Yb3Ga5O12 nanocrystalline garnet

“…Many works on Yb 3 Ga 5 O 12 garnets are devoted to the study of magnetic properties, [38][39][40][41] dielectric properties, 42 and applicability in thermophotovoltaics. 43,44 However, only a few studies deal with photoluminescence in RE-doped 45 or TM-doped 46 Yb 3 Ga 5 O 12 nanocrystalline garnets. Dulda 45 prepared Nd 3+ /Er 3+ -doped Yb 3 Ga 5 O 12 nanocrystals by precipitation of chlorides using the NaOH addition in presence of surfactant and studied the nearinfrared photoluminescence and the visible UCPL emission.…”

“…The attention of the present study is paid to the Er 3+ ‐doped Yb 3 Ga 5 O 12 nanocrystalline garnet as deep‐red upconversion emitting phosphor prepared by combustion technique. Many works on Yb 3 Ga 5 O 12 garnets are devoted to the study of magnetic properties, 38–41 dielectric properties, 42 and applicability in thermophotovoltaics 43,44 . However, only a few studies deal with photoluminescence in RE‐doped 45 or TM‐doped 46 Yb 3 Ga 5 O 12 nanocrystalline garnets.…”