摘要
利用稳态吸收和荧光光谱学、瞬态荧光光谱学(时间相关单光子计数技术)系统研究了EPPTC掺杂的F8BT薄膜异质结结构中激发复合体的形成机理和荧光发射特性,并表征了其特征光谱和荧光发射寿命.其特征主要体现在显著延长的荧光发射寿命和红移的荧光发射光谱.这对于理解有机半导体材料异质结结构形成的机理和光物理学特性研究提供了多方面的实验依据.同时,由于这两种材料混合后的吸收光谱较宽范围地覆盖了可见光谱区,这样的有机半导体掺杂工艺对于有机光伏器件和太阳能电池器件的应用研究具有重要意义.
Blends and doping of organic semiconductors are generally employed to improve effectively the charge transfer and dissociation performance.The absorption spectrum may be optimized making use of the different energy states of the components in the blends, which may favor the development of the photovoltaic or solar cell devices.Excellent type-Ⅱheterojunction structures can be produced by mixing the small-molecule perylene（EPPTC） and a copolymer of polyfluorene（F8BT）.Actually,F8BT and EPPTC exhibit absorptions in the blue region and in the green region,respectively.Thus,the blend will have a much broadened absorption spectrum.In the experiment,the blend solution of these two materials in chloroform is spin-coated onto a piece of glass substrate,so that EPPTC is doped into the polymer of F8BT and the heterojunction structure forms in the final solid film.Then,steady-state absorption and fluorescence spectroscopy,as well as the transient photoluminesence spectroscopy（time-correlated single-photon counting）,is used to investigate the formation and the photoluminescence properties of exciplex in the heterojunction film of F8BT doped with EPPTC. The photoluminscence（PL） spectrum and the life-time are measured to characterize the exciplex in the blend film,where the longer life-time of the red-shifted PL spectrum confirms the formation of the exciplex.This provides various experimental data for understanding the formation and the photophysical properties of the heterojunction structures in organic semiconductor blends.Futhermore, the absorption of the blend film covers a large range of the visible spectrum.Therefore,this kind of doping of organic semiconductor is important for the development of photovoltaic and solar cell devices.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2012年第2期405-410,共6页
Acta Physica Sinica
基金
国家自然科学基金(批准号:111074018)
新世纪优秀人才支持计划
高等学校博士学科点专项(批准号:20091103110012)
教育部留学回国人员科研启动基金资助的课题~~
