1. 毕业设计（论文）的内容和要求
与单光子泵浦发光不同，多光子发光介质（激发波长在带隙以下区域）必须通过同时吸收两个或更多个光子来实现。
从基本的角度来看，多光子泵浦发光是实现光的频率上变频的一种有前途的方法。
另外，长波光束通常在样品中具有更大的穿透长度，这为研究材料的内部物理性质提供了更多机会，并且还有效地抑制了由于表面缺陷而引起的非辐射复合。
2. 参考文献
1. Lee S, Kim D. Symmetry-Dependent Intramolecular Charge Transfer Dynamics of Pyrene Derivatives Investigated by Two-Photon Excitation[J]. The Journal of Physical Chemistry A, 2016, 120(46): 9217-9223.2. Wang K, Gao Z, Zhang W, et al. Exciton funneling in light-harvesting organic semiconductor microcrystals for wavelength-tunable lasers[J]. Science Advances, 2019, 5(6): eaaw2953.3. Wang X, Zhou H, Yuan S, et al. Cesium lead halide perovskite triangular nanorods as high-gain medium and effective cavities for multiphoton-pumped lasing[J]. Nano Research, 2017, 10(10): 3385-3395.4. Wang X, Bai L, Shen L, et al. Nonlinear optical switching behavior of nitrogen-doped carbon dots[J]. Optical Materials, 2019, 95: 109216.5. Sangsu Lee and Dongho Kim . Symmetry-Dependent Intramolecular Charge Transfer Dynamics of Pyrene Derivatives Investigated by Two-Photon Excitation [j].Physical Chemistry,2016,120,9217-92236. Kang wang,Zhenhua Gao. Exciton funneling in light-harvesting organic semiconductor microcrystals for wavelength-tunable lasers [j]. Science Adcances,2019-5,eaaw29537. Takumi Yamada,Yasuhiro Yamada,Yumi Nakaike. Photon Emission and Reabsorption Processes in CH3NH3PbBr3 Single Crystals Revealed by Time-Resolved Two-Photon-Excitation Photoluminescence Microscopy[j].American Physical Society,2017,014001-28. D. C. Hutchings and B. S. Wherrett, Phys. Rev. B: Condens. Matter Mater. Phys., 1994, 49, 24182426. 9. Z. Gu, K. Wang, W. Sun, J. Li, S. Liu, Q. Song and S. Xiao, Adv. Opt. Mater., 2016, 4, 472479. 10. B. R. S. Grant Walters, S. Hoogland, D. Shi, R. Comin, D. P. Sellan, A. E. H. S. Osman and M. Bakr, ACS Nano, 2015, 9, 93409346. 11. Y. Jiang, X. Wen, A. Benda, R. Sheng, A. W. Y. Ho-Baillie, S. Huang, F. Huang, Y.-B. Cheng and M. A. Green, Sol. Energy Mater. Sol. Cells, 2016, 151, 102112.12. Sun, Y.; Zhou, B. ; Lin, Y. i; Wang, W. ; Fernando, K. A. ; Pathak, P. ; Meziani, M. J. ; Harruff, B. A.; Wang, X. ; Wang, H. ; Luo, P. G. ; Yang, H. ; Kose, M. E. ; Chen, B. ; Veca, L. M. ; Xie, S. Quantum-Sized Carbon Dots for Bright and Colorful Photoluminescence. J. Am. Chem. Soc., 2006, 128 (24): 7756-7757.13. Zhao, Q.; Zhang, Z.; Huang, B.; Peng,; Zhang, M. ; Pang, D. Facile preparation of low cytotoxicity fluorescent carbon nanocrystals by electrooxidation of graphite. Chem. Commun., 2008 (41): 5116-5118.14. Jia, X.; Li, J. ; Wang, E. One-Pot Green Synthesis of Optically PH-Sensitive Carbon Dots with Upconversion Luminescence. Nanoscale, 2012 (4): 5572-5575.15. Wang, P.; Anilkumar, P. ; Cao, L. Carbon Dots of Different Composition and Surface Functionalization:Cytotoxicity Issues Relevant to Fluorescence Cell Imaging. Exp. Biol. Med., 2011 (236): 1231-1235.16. Fernando, K. A. ; Sahu, S. ; Liu, Y. ; Lewis, W. K. ; Guliants, E. A.; Jafariyan, A. ; Wang, P. ; Bunker, C. E. ; Sun, Y. Carbon Quantum Dots and Applications in Photocatalytic Energy Conversion. ACS Appl. Mater. Interfaces., 2015, 7 (16): 8363-8376.
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