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首页> 外文会议>Materials Research Society Symposium on Organic Electronics >Single Molecule Studies of a 2,7-Bis-(Phenylethenyl)fluorenone: Implications for Green-Emission Bands in Fluorene-Based OLEDs
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Single Molecule Studies of a 2,7-Bis-(Phenylethenyl)fluorenone: Implications for Green-Emission Bands in Fluorene-Based OLEDs

机译：2,7-双（苯基乙烯基）芴酮的单分子研究：对芴基OLED中的绿色发射带的影响

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The color purity of blue polyfluorene fluorescence emission is often adversely contaminated by green emission bands. The origin of this green emission has been attributed to various factors including on-chain oxidation of fluorene leading to monomeric fluorenone emission and inter/intra-chain interaction between segments of fluorenone units leading to excimer formation on the polyfluorene backbone. We report here emission properties at the bulk and single molecule level of a molecular fluorene derivative and compare them to those of its oxidative fluorenone derivative. Whereas the bulk fluorescence emission of 2,7-bis(3,4,5-trimethoxyphenylethenyl)-9,9-diethyl-9H-fluorene (OFPV) exhibits a blue to blue-green emission at about 480nm, 2,7-bis(3,4,5-trimethoxyphenylethenyl)-9,9-diethyl-9H-fluorenone (OFOPV) shows red luminescence with a peak centered at about 630nm. However, the peak position for OFOPV shifts to higher energies (～540nm) upon dilution or dispersion in polymer matrices like PMMA or Zeonex. Single molecule measurements of OFOPV show fluorescence spectra dominated by peaks around 540nm, with a small minority at longer wavelengths that are attributed to emission from dimers or higher aggregates. This distribution indicates that monomeric emission of OFOPV is green, consistent with green emission bands seen in polyfluorenes.
机译：蓝色聚芴荧光发射的颜色纯度通常受到绿色发射带的不利污染。这种绿色排放的起源归因于各种因素，包括芴的链链氧化，导致单体含氟醌发射和氟镍单元区段之间的间/内部间相互作用，导致在多氟烯骨架上形成准分子形成。我们在这里报告了分子芴衍生物的体积和单分子水平的排放性能，并将它们与其氧化芴酮衍生物的分子进行比较。虽然2,7-双（3,4,5-三甲氧基苯基乙烯基）-9,9-二乙基-9h-芴（OFPV）的大量荧光发射显示出蓝绿色发射的蓝绿色发射，约480nm，2,7-双（3,4,5-三甲氧基苯基乙烯基）-9,9-二乙基-9H-芴酮（OFOPV）显示红色发光，峰值以约630nm为中心。然而，OFVV的峰位置在稀释或分散在PMMA或Zeonex等聚合物基质中稀释或分散时转移到更高的能量（〜540nm）。 OFOPV的单分子测量显示由540nm的峰的荧光光谱显示，具有少数少数少数波长，其归因于二聚体或更高聚集体的发射。该分布表明OFOPV的单体排放是绿色的，与在多氟醚中看到的绿色发射带一致。

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