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Molecular structure of styrylbenzene derivatives (BSB and SBD) and CBP host.
Dependence of PL intensity on excitation power in 6 wt %-BSB-Cz (BSB4):CBP film (100 nm). Inset: Fluorescence spectrum and ASE spectrum with an excitation power of in this film.
Temperature dependence of PL efficiency and transient lifetime of 6 wt %-BSB-Cz (BSB4):CBP film (100 nm).
ASE wavelength , ASE threshold , absolute PL efficiency , PL transient lifetime , and radiative decay rate of 6 wt %-styrylbenzene derivative in a CBP host are summarized. In the case of SBD6–9, no ASE was observed and the PL peak wavelengths are summarized in the parenthesis. In the cases of SBD3 and 4, the ASE thresholds are were unclear, although an appreciable PL spectral narrowing was observed and, therefore, the values correspond to the onset of the spectral narrowing.
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