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Dual-Color Lasers in Interlayer-Free Solution Processed Polymeric Bilayer Devices
Zhiyuan Zhang1, Qi Zhang2, Xuanxuan Wei1
1Key Laboratory for Organic Electronics & Information Displays (KLOEID), Jiangsu-Singapore Joint Research Center for Organic/Bio Electronics & Information Displays, Institute of Advanced Materials (IAM), Nanjing University of Posts and Telecommunications, 9 Wenyuan Road, Nanjing 210046, China.
This study demonstrates dual-wavelength organic lasers using sequential spin coating of immiscible polymers. These compact bilayer devices achieve blue-green or blue-red amplified spontaneous emission (ASE) and lasing, paving the way for efficient multi-color organic light sources.
Area of Science:
- Organic electronics
- Photonics
- Materials science
Background:
- Multiwavelength organic lasers are desirable for cost-efficiency and processability.
- Existing methods often involve complex fabrication steps.
- Organic materials offer tunable emission properties.
Purpose of the Study:
- To achieve dual-wavelength amplified spontaneous emission (ASE) and lasing in compact bilayer organic devices.
- To explore the use of immiscible polymeric gain media for multi-color emission.
- To investigate the role of two-dimensional distributed feedback (2D DFB) gratings in achieving single-mode lasing.
Main Methods:
- Sequential spin coating of immiscible polymeric gain media (PFN-Br, F8BT, P3HT) to form bilayer structures.
- Utilizing a common UV absorption band (390 nm) for simultaneous excitation of both layers.
- Integrating two-dimensional (2D) square distributed feedback (DFB) gratings with varying periods as optical cavities.
- Focusing excitation laser spots on specific DFB grating areas to achieve selective emission wavelengths.
Main Results:
- Achieved dual-wavelength (blue-green or blue-red) ASE in bilayer devices without interlayers.
- Demonstrated single-mode blue-green and blue-red lasers with low thresholds (245 μJ cm⁻² and 189 μJ cm⁻², respectively) using 2D DFB gratings.
- Confirmed efficient light confinement for red emission along the diagonal and blue emission along the rectangle of the 2D DFB gratings.
- Successfully achieved simultaneous blue and red lasing from a single PFN-Br/F8BT:P3HT bilayer device on a 300 nm period 2D DFB grating.
Conclusions:
- A simple and effective method for fabricating dual-wavelength organic lasers using immiscible polymer bilayers was developed.
- The compact device architecture and tailored 2D DFB gratings enable efficient multi-color lasing.
- This approach holds significant potential for developing advanced organic optoelectronic devices and applications.
