Wavelength-tunable organic semiconductor lasers based on mechanically stretchable polydimethylsiloxane (PDMS) gratings were developed. The intrinsic stretchability of PDMS was explored to modulate the period of the distributed feedback gratings for fine tuning the lasing wavelength. Notably, elastic lasers based on three typical light-emitting molecules show com-parable lasing threshold values analogous to rigid devices and a continuous wavelength tunability of about 10 nm by mechanic-al stretching. In addition, the stretchability provides a simple solution for dynamically tuning the lasing wavelength in a spec-tral range that is challenging to achieve for inorganic counterparts. Our work has provided a simple and efficient method of fab-ricating tunable organic lasers that depend on stretchable distributed feedback gratings, demonstrating a significant step in the advancement of flexible organic optoelectronic devices.
Chengfang LiuHe LinDongzhou JiQun YuShuoguo ChenZiming GuoQian LuoXu LiuWenyong Lai
Inspired by nature’s molecular machines,the scientific research on solid-state molecular rotors is of great interest yet remains largely unexplored.Herein,we report a unique example of a thermal energydriven stimuli-responsive solid-state molecular rotor,which features an o-carborane moiety as a rotor that directly transduces the surrounding thermal energy into molecular rotations in the crystalline state.Its rotation is confirmed by X-ray diffraction.
Treatment of 1,2-C6H4（SiH3）（SiH3） （1） or 1,2-C6H4（SiMe2H）（SiH3） （2） with Pd（dcpe）（PEt3）2 （dcpe？=？Cy2PCH2CH2PCy2） in the ratio of 1∶1 affords two cis- bis（silyl） palladium（II） complexes {1,2-C6H4（SiH2）（SiH2）}PdII（dcpe） （3） and {1,2- C6H4（SiMe2）（SiH2）}PdII（dcpe） （4） with good thermal stability respectively. To the best of our knowledge, only ten silyl palladium complexes prepared from these two chelating hydrosilane ligands are presented in the Cambridge Structural Database. The structures of complexes 3 and 4 are unambiguously determined by single crystal X-ray analysis and multinuclear NMR spectroscopic studies.
