研究目的
Exploring the photoluminescence (PL) from thin films made of anilino-squaraines to analyze the H- versus J-character and probe the spatial homogeneity of differently prepared SQIB films.
研究成果
The study demonstrates that the optical properties of SQIB thin films can be probed at the level of individual grains and systematically modified by thermal treatment. High-temperature films show uniform J-type emission, while low-temperature films exhibit a mixture of H- and J-type emissions. The findings highlight the potential for controlling the performance and lifetimes of optoelectronic devices through thermal treatment.
研究不足
The study is limited by the spatial resolution of the optical approach, which may not fully resolve smaller polarization domains in low-temperature films. Additionally, the correlation between single- and double peak PL and topographic features is less obvious in low-temperature films.
1：Experimental Design and Method Selection:
Temperature-dependent and spatially resolved PL spectroscopy was employed to probe the optical properties of spin-cast squaraine thin films annealed to different temperatures.
2：Sample Selection and Data Sources:
The experiments were performed with 2,4-bis[4-(N,N-diisobutylamino)-2,6-dihydroxy-phenyl]squaraine (SQIB), synthesized and spin-cast onto cover slip glasses.
3：List of Experimental Equipment and Materials:
Optical microscope (Olympus BX 41), confocal laser microscope from Witec, laser diode of 655 nm wavelength and 5 mW power, grating spectrograph (300 lines mm?1), single-line, liquid-nitrogen cooled InGaAs detector.
4：Experimental Procedures and Operational Workflow:
The films were post-annealed to either 380 or 450 K for 60 min. PL was examined with a spatially resolving and a non-local PL setup.
5：Data Analysis Methods:
The PL data were analyzed for their specific vibrational signature and spatial homogeneity.
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