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Molecular N-Type Doping Unlocks Low-Threshold Nanosecond Lasing in a Microcavity-Integrated OLED Toward Electrically
Wei Cheng1,2, Bo Peng1,2, Chenmiao Zhao2,3
1Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing, China.
Angewandte Chemie (International Ed. in English)
|June 9, 2026
Summary
Molecular doping enables electrically pumped organic lasers by balancing charge transport in high-gain semiconductors. This breakthrough paves the way for practical organic laser diodes with reduced efficiency roll-off.
Area of Science:
- Optoelectronics
- Materials Science
- Organic Electronics
Background:
- Organic semiconductors offer potential for flexible, tunable lasers, but practical applications are hindered by reliance on inefficient pulsed optical pumping.
- Achieving electrically pumped organic lasers faces a materials challenge: high optical gain often correlates with poor charge transport, limiting device performance.
Purpose of the Study:
- To overcome the trade-off between high optical gain and balanced charge transport in organic semiconductors for laser applications.
- To demonstrate a practical architecture for electrically pumped organic lasers using molecular doping.
Main Methods:
- Fabrication of an organic light-emitting diode (OLED) using a spirofluorene derivative and an n-type doped layer to improve charge transport.
- Integration of the OLED with a distributed feedback (DFB) resonator to achieve lasing.
- Characterization using electroluminescence, transient absorption measurements, and optical-electrical co-pumping.
Main Results:
- Demonstrated balanced charge transport in a high-gain organic semiconductor, significantly suppressing singlet-polaron annihilation and reducing efficiency roll-off.
- Achieved ultra-narrow electroluminescence (∼2 nm bandwidth) under pulsed current injection.
- Observed low-threshold nanosecond lasing under optical-electrical co-pumping, indicating a viable path toward organic laser diodes.
Conclusions:
- Molecular doping is an effective strategy to resolve the intrinsic materials dilemma in organic semiconductors for laser applications.
- The developed OLED architecture with a DFB resonator shows promise for practical, electrically driven organic lasers.
- This research opens avenues for light amplification in organic materials under electrical excitation.
