Energy transfer and enhanced 1532 nm emission in Er3+ and Ce3+ co-doped Y3Al5O12 nano-particles

Abstract A series of Y 3 Al 5 O 12 :Ce 3+ , Er 3+ (YAG:Ce, Er) nano-particles were synthesized by polymer-assisted sol–gel method. X-ray diffraction measurements reveal that a pure crystalline phase of YAG is achieved at temperature as low as 800 °C. The energy transfer from Ce 3+ to Er 3+ is studied based on photoluminescence spectroscopy and fluorescence decay patterns. It results that the emission intensity of Er 3+ at near infrared (NIR) 1532 nm under indirect excitation of Ce 3+ (460 nm) is 10 times stronger than that of direct excitation of Er 3+ (275 or 380 nm). The energy transfer efficiency is estimated as 95.5% for YAG:Ce 0.03 Er 0.09 sample. The very efficient energy transfer path and mechanism are also discussed.