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Updated: Jul 19, 2025

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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.

ACS Applied Materials & Interfaces
|August 10, 2023
PubMed
Summary

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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.
Keywords:
multicolor lasermultilayer waveguideorthogonal solvent processing methodsolid-state organic laserwater/alcohol-soluble polyfluorene

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  • 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.