CdTe量子点-铜酞菁复合体系荧光共振能量转移的研究?

何志聪; 李芳; 李牧野; 魏来

doi:10.7498/aps.64.046802

武汉工程大学理学院,武汉,430073

华中科技大学物理学院,武汉,430074

Fluorescence resonance energy transfer b etween CdTe quantum dots and copp er phthalo cyanine

摘要: 以波长为780 nm、重复频率为76 MHz、脉宽为130 fs的飞秒激光作为激发光源，采用超快时间分辨光谱技术研究了CdTe量子点-铜酞菁复合体系的荧光共振能量转移.实验结果表明，在780 nm的双光子激发条件下，复合体系中CdTe量子点的荧光寿命随着铜酞菁溶液浓度的增加而减少，荧光共振能量转移效率增加.同时也研究了激发功率对荧光共振能量转移效率的影响.结果表明，随着激发光功率的增加，复合体系溶液中CdTe量子点的荧光寿命增加，荧光共振能量转移效率减小，其物理机理是因为高激发功率下的热效应和由双光子诱导的高阶激发态的跃迁.当激发光功率为200 mW时，双光子荧光共振能量转移效率为43.8%.研究表明CdTe量子点-铜酞菁复合体系是非常有潜力的第三代光敏剂.

关键词:

Abstract: The fluorescence resonance energy transfer in CdTe quantum dots (QDs)-copper phthalocyanine (CuPc) is inves-tigated by ultrafast time-resolved spectroscopy technique equipped with femtosecond laser (780 nm, 76 MHz, 130 fs). The results show that the fluorescence lifetime of CdTe QDs decreases with the increase of CuPc concentration, and the energy transfer e?ciency is found to increase with the increase of CuPc concentration. Moreover, the influence of the laser excitation power on the energy transfer e?ciency is also studied. It is found that transfer e?ciency decreases as excitation laser power increases, the physical mechanism is the thermal activation in the high power and the excited state transitions of high order induced by two-photon. The energy transfer e?ciency can reach 43.8%, when the laser power is 200 mW, via two-photon excitation. This study indicates that the CdTe QDs-CuPc composite system has high potential as the third generation of photosensitizers.

CdTe量子点-铜酞菁复合体系荧光共振能量转移的研究?

武汉工程大学理学院,武汉,430073

华中科技大学物理学院,武汉,430074

关键词:

Fluorescence resonance energy transfer b etween CdTe quantum dots and copp er phthalo cyanine

武汉工程大学理学院,武汉,430073

华中科技大学物理学院,武汉,430074

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