Efficient near-infrared quantum cutting in NaYF_4: Ho^3+, Yb^3+ for solar photovoltaics
2011; Optica Publishing Group; Volume: 19; Issue: 3 Linguagem: Inglês
10.1364/oe.19.001749
ISSN1094-4087
AutoresKaimo Deng, Tao Gong, Lingxun Hu, Xiantao Wei, Yonghu Chen, Min Yin,
Tópico(s)Photorefractive and Nonlinear Optics
ResumoQuantum cutting converting a ultraviolet photon into two near-infrared photons has been demonstrated by spectroscopic measurements in NaYF4:Ho3+,Yb3+ synthesized by hydrothermal method. Evidence is provided to confirm the occurrence of quantum cutting. Upon excitation of Ho3+ 5G4 level, near-infrared quantum cutting could occur through a two-step resonance energy transfer from Ho3+ to Yb3+ by cross relaxation, with a maximum quantum efficiency of 155.2%. This result reveals the possibility of violet to near-infrared quantum cutting with a quantum efficiency larger than 100% in Ho3+/Yb3+ codoped fluorides, suggesting the possible application in modifying the solar spectrum to enhance the efficiency of silicon solar cells.
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