期刊
ADVANCED OPTICAL MATERIALS
卷 7, 期 20, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adom.201900899
关键词
continuum white light; graphene; oxide phosphor; photon-to-photon conversion process; ratiometric temperature sensing
资金
- National Key RAMP
- D Program of China [2018YFB1107200]
- National Natural Science Foundation of China [61775192, 51772270]
- State Key Laboratory of Precision Spectroscopy (East China Normal University)
- Open Fund of the Wuhan Optoelectronic National Research Center, Huazhong University of Science and Technology
- Opening Project of the State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences [SKL201706SIC]
- Fundamental Research Funds for the Central Universities
- State Key Laboratory of High Field Laser Physics (Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences)
Recent observations suggest that continuum white light generation driven by a near infrared (NIR) laser is not limited to rare earth (RE) doped phosphors, but is rather a general photophysical process of light-matter interaction as long as the NIR laser energy is efficiently absorbed. Since the proposed explanations seem to be material-dependent, a comparative investigation on the white light generation in graphene, and its mixture with a typical RE-doped oxide phosphor is reported here for a general understanding of this process. In contrast to the steady increase of white light intensity in graphene, the white light generated from the oxide phosphor and their mixtures with graphene exhibits a stepwise growth of intensity with laser power. By using the temperature-dependent upconversion luminescence as ratiometric temperature sensing, it is observed that this emission is closely correlated with the jumps in temperature with the rise of excitation power. Since the black body temperatures are much higher than the temperatures derived by the ratiometric method, it is suggested that this process can be understood by a general thermally assisted direct photon-to-photon conversion process, rather than by pure thermal radiation. The results of this work may have important implication for the understanding and design of efficient continuum white light sources.
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