Photonics Research, 2018, 6 (10): 10000943, Published Online: Sep. 25, 2018   

Integration of nanoscale light emitters: an efficient ultraviolet and blue random lasing from NaYF4:Yb/Tm hexagonal nanocrystals

Author Affiliations
1 Shenzhen Key Laboratory of Laser Engineering, Key Laboratory of Advanced Optical Precision Manufacturing Technology of Guangdong Higher Education Institutes, College of Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China
2 University Research Facility in Materials Characterization and Device Fabrication, The Hong Kong Polytechnic University, Hong Kong 999077, China
3 Department of Applied Physics, The Hong Kong Polytechnic University, Hong Kong 999077, China
4 Key Laboratory of Materials for High Power Laser, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
5 e-mail: zhangwf@szu.edu.cn
6 e-mail: scruan@szu.edu.cn
Abstract
Near infrared light-controlled release of payloads from ultraviolet-sensitive (UV-sensitive) polymer hydrogels or nanocarriers is one of the most promising strategies for biotherapy. Here, we propose the concept of light activation of NaYF4:20%Yb,2%Tm nanocrystals (NCs). NaYF4:20%Yb,2%Tm NCs are synthesized by a solvothermal method. Effective upconversion luminescence from NaYF4:20%Yb,2%Tm NCs excited by a continuous wave (CW) 980 nm laser is obtained. The NaYF4:20%Yb,2%Tm NCs are then used as a laser gain medium and sandwiched between Al and quartz reflectors to form laser microcavities. UV and blue upconverted random lasing is obtained from the laser microcavities. Hence, we verify explicitly that the NaYF4:Yb,Tm NCs support UV and blue upconversion random lasing via a 980 nm nanosecond laser excitation. Our work provides what we believe is a new concept for precision and localized cancer therapy by external light excitation.

Ya-Pei Peng, Wei Lu, Pengpeng Ren, Yiqun Ni, Yunfeng Wang, Long Zhang, Yu-Jia Zeng, Wenfei Zhang, Shuangchen Ruan. Integration of nanoscale light emitters: an efficient ultraviolet and blue random lasing from NaYF4:Yb/Tm hexagonal nanocrystals[J]. Photonics Research, 2018, 6(10): 10000943.

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