Thermal radiation properties of porous rare-earth garnet ceramics

Abstract

ceramics for emitters of thermophotovoltaic systems were made by solid-state reaction. Thermal radiation measurements revealed that the sufficiently porous ceramics had excellent selectivity regarding emission wavelengths. Generally, in spite of the narrow-band thermal emission of rare-earth ions, most ceramics do not present sufficient selectivity because of their transparency in the near infrared range. We discuss a mechanism for high selectivity from observing the microstructures of these developed ceramics.

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.…”