并五苯掺杂三苯薄膜的光物理研究
Photophysics of pentacene-doped picene thin films
摘要：
本文报道了并五苯分子掺杂的三苯纳米晶薄膜的研究。该薄膜通过超声分子束沉积生长，掺杂浓度在每104个并五苯分子少于一个并五苯分子至每102个并五苯分子约一个并五苯分子之间。薄膜的形貌和光电性能作为掺杂剂的浓度的函数进行了研究。通过吸收光谱、稳态光致发光光谱和时间分辨光致发光光谱的测量，研究了并五苯掺杂对三苯薄膜光学响应的影响。从并五苯主体基质到并五苯客体分子的有效能量转移被观察到，从而引起并五苯发出强烈的光致发光。这种有效的机制打开了利用应用的可能性，其中客体组分的激子态，并五苯，是主要的兴趣，如微波激射器。所观察到的机理也可以作为原型系统的主客体系统的非并苯和并苯的基础上的电子物理研究。
英文摘要：
Here were report a study of picene nano-cristalline thin films doped with pentacene molecules. The thin films were grown by supersonic molecular beam deposition with a doping concentration that ranges between less than one molecules of pentacene every 104 picene molecules up to about one molecule of pentacene every 102 of picene. Morphology and opto-electronic properties of the films were studied as a function of the concentration of dopants. The optical response of the picene films, characterized by absorption, steady-state and time-resolved photoluminescence measurements, changes dramatically after the doping with pentacene. An efficient energy transfer from the picene host matrix to the pentacene guest molecules was observed giving rise to an intense photoluminescence coming out from pentacene. This efficient mechanism opens the possibility to exploit applications where the excitonic states of the guest component, pentacene, are of major interest such as MASER. The observed mechanism could also serve as prototypical system for the study of the photophysics of host guest systems based on different phenacenes and acenes.
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