Near infrared emissions from both high efficient quantum cutting (173%) and nearly-pure-color upconversion in NaY(WO4)2:Er3+/Yb3+ with thermal management capability for silicon-based solar cells

Abstract Raising photoelectric conversion efficiency and enhancing heat management are two critical concerns for silicon-based solar cells. In this work, efficient Yb 3+ infrared emissions from both quantum cutting and upconversion were demonstrated by adjusting Er 3+ and Yb 3+ concentrations, and thermo-manage-applicable temperature sensing based on the luminescence intensity ratio of two super-low thermal quenching levels was discovered in an Er 3+ /Yb 3+ co-doped tungstate system. The quantum cutting mechanism was clearly decrypted as a two-step energy transfer process from Er 3+ to Yb 3+ . The two-step energy transfer efficiencies, the radiative and nonradiative transition rates of all interested 4 f…

• NN
  National Natural Science Foundation of China

  Award: 12274049
• FR
  Fundamental Research Funds for the Central Universities

  Award: 3132023519