Downconversion mechanism in Er3+/Yb3+ codoped fluorotellurite glasses to enhance the efficiency of c-Si PV cells

Pushing the Limits: Down‐Converting Er3+‐Doped BaF2 Single Crystals with Photoluminescence Quantum Yield Surpassing 100%

“…In addition, Aouaini et al [35] investigated Er 3+ -doped tellurite glass as a luminescent material for solar concentrators, estimating a quantum efficiency of 91% for the 4 I 13/2 emission band under 488 nm excitation. The authors suggest that after absorption of a 488 nm photon that populates the 4 Several other works, as referenced in [36] and [37] have also suggested the use of Er 3+ /Yb 3+ co-doped materials to improve the performance of Si solar cells. In both works cross-relaxation processes, such as Er 3+ :( 4 S 3/2 )+ Yb 3+ :( 2 F 7/2 )→ Er 3+ :( 4 I 11/2 )+ Yb 3+ :( 2 F 5/2 ) lead to a population of the 2 F 5/2 state of the Yb 3+ and following emission of the photons with the wavelength around 1 um.…”

“…Several other works, as referenced in [ 36 ] and [ 37 ] have also suggested the use of Er 3+ /Yb 3+ co‐doped materials to improve the performance of Si solar cells. In both works cross‐relaxation processes, such as Er 3+ :( 4 S 3/2 )+ Yb 3+ :( 2 F 7/2 )→ Er 3+ :( 4 I 11/2 )+ Yb 3+ :( 2 F 5/2 ) lead to a population of the 2 F 5/2 state of the Yb 3+ and following emission of the photons with the wavelength around 1 um.…”