Tunable amplified spontaneous emission in graphene quantum dots doped cholesteric liquid crystals.
Graphene quantum dots (GQDs) have received much research attention, because of their useful structure and optical absorption/emission. We report the tunable amplified spontaneous emission (ASE) in GQD-doped cholesteric liquid crystal (CLC), which to the best of our knowledge has not been previously observed. The GQDs are uniformly dispersed with a weight ratio of 0.5 wt.% in CLC. Under optical excitation, typical ASE is triggered in the system at pump energies greater than 1.25 mJ cm-2. The emission peak at the long wavelength edge of the photonic bandgap shifts from 662 to 669 nm, as the working temperature is increased from 50 to 90 °C. The preparation of the combined GQDs and CLC is simple and low-cost, and the resulting material is photostable and non-toxic. Combining the GQD gain material with the self-assembled CLC resonator has potential in the fabrication of ASE source and laser devices.
Key Laboratory of Opto-Electronics Information Technology, Ministry of Education, School of Precision Instruments and Opto-Electronics Engineering, Tianjin University, Tianjin 300072, People's Republic of China.
Mingxuan
M
Cao
Siwei
S
Yang
Yating
Y
Zhang
Xiaoxian
X
Song
Yongli
Y
Che
Haiting
H
Zhang
Yu
Y
Yu
Guqiao
G
Ding
Guizhong
G
Zhang
Jianquan
J
Yao