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High-performance organic light-emitting diodes based on dioxolane-substituted pentacene derivatives

机译:基于二氧戊环取代的并五苯衍生物的高性能有机发光二极管

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摘要

Organic light-emitting diodes (OLEDs) containing red-light-emitting dioxolane-substituted pentacene derivatives are fabricated and characterized. The OLEDs feature guest-host emitting layers consisting of either 6,14-bis(triisopropylsilylethynyl)1,3,9,11-tetraoxa-dicyclopenta[b,m]pentacene (TP-5) or 2,2,10,10-tetraethyl-6,14-bis(triisopropylsilylethynyl)-1,3,9,11-tetraoxadicyclopenta[b,m]pentacene (EtTP-5) dispersed in tris(quinolin-8-olato) aluminum(III) (Alq(3)). High external electroluminescence (EL) quantum efficiency (eta(EL) = 3.3 %), not far from the theoretical limit, is observed for an OLED device based on a dilute EtTP-5:Alq(3) emitting layer (0.25 mol % EtTP-5). The proposed EL mechanism is a combination of Forster energy transfer and direct electron-hole recombination on the guest pentacene molecules, as inferred by changes in the EL versus photoluminescence spectra and the positions of the highest occupied molecular orbital and lowest unoccupied molecular orbital gap of the guest within that of the host (estimated via cyclic voltammetry). Further evidence of charge trapping is provided by increased operational voltages at increased guest-molecule concentration.
机译:制备并表征了包含红色发光的二氧戊环取代的并五苯衍生物的有机发光二极管(OLED)。 OLED的特征是由6,14-双(三异丙基甲硅烷基乙炔基)1,3,9,11-四氧杂-二环戊[b,m]并五苯(TP-5)或2,2,10,10-分散在三(喹啉-8-olato)铝(III)中的四乙基-6,14-双(三异丙基甲硅烷基乙炔基)-1,3,9,11-四恶二环戊并[b,m]并五苯(EtTP-5)(Alq(3) )。对于基于稀EtTP-5:Alq(3)发光层(0.25 mol%EtTP)的OLED器件,观察到较高的外部电致发光(EL)量子效率(eta(EL)= 3.3%),与理论极限相差不远-5)。所提出的EL机理是在客体并五苯分子上进行Forster能量转移和直接电子-空穴重组的结合,这可以通过EL与光致发光光谱的变化以及该分子的最高占据分子轨道和最低未占据分子轨道间隙的位置来推断。客体中的客体(通过循环伏安法估算)。通过在增加的客体分子浓度下增加的工作电压提供了电荷俘获的进一步证据。

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