研究目的
To investigate the role of polarized species in organic semiconductor lasers (OSLs) and their impact on the design of OSL materials.
研究成果
The study reveals that polarized species formed by intermolecular charge transfer (CT) interaction between carbazole and benzothiadiazole groups act as structural defects, negatively affecting the emitting properties of OSL materials. The design of OSL materials should avoid specific group combinations to reduce the influence of these polarized species.
研究不足
The study focuses on small molecules and may not fully represent the behavior of conjugated polymers. The influence of polarized species under electrical injection is inferred from optical pumping results.
1：Experimental Design and Method Selection:
The study uses amplified spontaneous emission (ASE) as a medium to investigate polarized species in OSL materials. Spectroscopic analysis and transient photophysics properties are employed to understand the nature of these species.
2：Sample Selection and Data Sources:
Two core-chain structural small molecules, OCBzC and DF-Bz-DF, are compared. These molecules have a benzothiadiazole chromophoric core and differ in the presence of carbazole end groups.
3：List of Experimental Equipment and Materials:
A nanosecond laser (440 nm, 7 ns pulse width, 20 Hz repetition rate) and a femtosecond laser (120 fs pulse width, 250 Hz repetition rate) are used for excitation. Spectroscopic ellipsometry and transient absorption (TA) measurements are conducted.
4：Experimental Procedures and Operational Workflow:
ASE measurement is taken on spin-coated films. TA spectral evolution is studied under different excitation conditions. UV-Vis-NIR absorption spectra and complex refractive index optical constants are determined.
5：Data Analysis Methods:
The ASE parameters, photoluminescent quantum yield, and fluoresce lifetime are analyzed. The dynamic signals around 540-550 nm are fitted using a reported model to understand the ASE process.
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