Photophysical properties of dioxolane-substituted pentacene derivatives dispersed in tris(quinolin-8-olato)aluminum(III).
Photophysical properties of dioxolane-substituted pentacene derivatives dispersed in tris(quinolin-8-olato)aluminum(III).
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分散在三(喹啉-8-醇)铝(III)中的二氧戊环取代并五苯衍生物的光物理性质。
DOI：
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发表时间：
2006
影响因子：
3.3
通讯作者：
Z. Kafafi
中科院分区：
文献类型：
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作者：
M. Wolak;J. Melinger;P. Lane;L. Palilis;C. A. Landis;J. Delcamp;J. Anthony;Z. Kafafi
合成了两种新的二氧戊环取代并五苯衍生物，即6，14-双-（三异丙基硅基乙炔基）-1，3，9，11-四氧杂二环并[B，m]并五苯（TP-5）和2，2，10，10-四乙基-6，14-双-（三异丙基硅基乙炔基）-1，3，9，11-四氧杂二环并[B，m]并五苯（EtTP-5），并对其进行了光谱表征。在这里，我们研究的稳态和时间分辨的光致发光（PL）的固态复合膜含有这些并五苯衍生物分散在三（喹啉-8-羟基）铝（III）（Alq（3））。薄膜显示出窄的红色发射和高的绝对光致发光量子产率（phi（PL）= 59%和76%的薄膜含有约0.25摩尔%的TP-5和EtTP-5，分别）。两个客主系统的福斯特转移半径估计约为33 A。TP-5/Alq（3）薄膜的荧光强度随着客体分子浓度的增加而显著降低，并五苯分子间的相互作用导致了弱辐射聚集体的形成.相比之下，对于EtTP-5/Alq（3）膜观察到较小程度的荧光猝灭。TP-5和EtTP-5的测量荧光寿命在低浓度下相似（约18 ns），但在较高浓度下偏离，因为聚集开始在TP-5/Alq（3）膜中起作用。EtTP-5/Alq（3）膜中的聚集开始发生在较高的客体分子浓度（>1.00摩尔%）下。在末端二氧戊环环上添加乙基导致固体中分子间间距的增加，从而降低了π-π分子堆叠和聚集的趋势。
Two novel dioxolane-substituted pentacene derivatives, namely, 6,14-bis-(triisopropylsilylethynyl)-1,3,9,11-tetraoxa-dicyclopenta[b,m]pentacene (TP-5) and 2,2,10,10-tetraethyl-6,14-bis-(triisopropylsilylethynyl)-1,3,9,11-tetraoxa-dicyclopenta[b,m]pentacene (EtTP-5), have been synthesized and spectroscopically characterized. Here, we examine the steady-state and time-resolved photoluminescence (PL) of solid-state composite films containing these pentacene derivatives dispersed in tris(quinolin-8-olato)aluminum(III) (Alq(3)). The films show narrow red emission and high absolute photoluminescence quantum yields (phi(PL) = 59% and 76% for films containing approximately 0.25 mol % TP-5 and EtTP-5, respectively). The Förster transfer radius for both guest-host systems is estimated to be approximately 33 A. The TP-5/Alq(3) thin films show a marked decrease in phi(PL) with increasing guest molecule concentrations, accompanied by dramatic changes in the PL spectra, suggesting that intermolecular interactions between pentacene molecules result in the formation of weakly radiative aggregates. In contrast, a lesser degree of fluorescence quenching is observed for EtTP-5/Alq(3) films. The measured fluorescence lifetimes of TP-5 and EtTP-5 are similar (approximately 18 ns) at low concentrations but deviate at higher concentrations as aggregation begins to play a role in the TP-5/Alq(3) films. The onset of aggregation in EtTP-5/Alq(3) films occurs at higher guest molecule concentrations (>1.00 mol %). The addition of ethyl groups on the terminal dioxolane rings leads to an increase in the intermolecular spacing in the solid, thereby reducing the tendency for pi-pi molecular stacking and aggregation.