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Progress in small-molecule luminescent materials for organic light-emitting diodes

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Science China Chemistry 2015年第6期58卷 907-915页

作者： Tiancheng Yu Linlin Liu Zengqi Xie Yuguang Ma State Key Laboratory of Luminescent Materials and Devices Institute of Polymer Optoelectronic Materials and Devices South China University of Technology

Organic light-emitting diodes （OLEDs） have been extensively studied since the first efficient device based on small molecular luminescent materials was reported by Tang. Organic electroluminescent material, one of the centerpieces of OLEDs, has been the focus of studies by many material scientists. To obtain high luminosity and to keep material costs low, a few remarkable design concepts have been developed. Aggregation-induced emission （AIE） materials were invented to overcome the common fluorescence-quenching problem, and cross-dipole stacking of fluorescent molecules was shown to be an effective method to get high solid-state luminescence. To exceed the limit of internal quantum efficiency of conventional fluorescent materials, phosphorescent materials were successfully applied in highly efficient electroluminescent devices. Most recently, delayed flu- orescent materials via reverse-intersystem crossing （RISC） from triplet to singlet and the ＂hot exciton＂ materials based on hy- bridized local and charge-transfer （HLCT） states were developed to he a new generation of low-cost luminescent materials as efficient as phosphorescent materials. In terms of the device-fabrication process, solution-processible small molecular lumi- nescent materials possess the advantages of high purity （vs. polymers） and low procession cost （vs. vacuum deposition）, which are garnering them increasing attention. Herein, we review the progress of the development of small-molecule luminescent materials with different design concepts and features, and also briefly examine future development tendencies of luminescent materials.

关键词： organic light-emitting diodes small molecular luminescent materials fluorescence phosphorescence delayed fluores-cence hybridized local and charge-transfer state

Terahertz radiation from pentacene organic diode at room temperature

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Chinese Optics Letters 2015年第1期13卷 66-71页

作者：邓剑王艳杨兵马於光 College of Chemistry Jilin University State Key Laboratory of Supramolecular Structure and Materials Jilin University

We investigate terahertz radiation （T-rays） from a pentacene organic diode at room temperature. The quantum chemistry calculation for frequency-related Huang Rhys factor of pentacene is also carried out. The results demonstrate that the T-rays can come from a bending vibration of pentacene skeleton after the energy of pentacene exeiton transferring to the vibrational excited state via electron-phonon coupling. Frequency and natural bond orbital analytics of pentacene and its derivatives are performed in order to explain the result and develop new materials to get higher emission. This work provides a new way to produce T-rays with a simDle device at room temperature.

关键词： Chemical bonds Electromagnetic wave emission Electron phonon interactions Excited states Phonons Quantum chemistry

Uniform composition film of hydrophilic colloidal gold nanoparticles and hydrophobic carbazole functionalized fluorene trimers for enhanced fluorescence and stability

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Chinese Science Bulletin 2013年第22期58卷 2741-2746页

作者： LIU LinLin XIE ZengQi MA YuGuang State Key Laboratory of Luminescent Materials and Devices Institute of Polymer Optoelectronic Materials and DevicesSouth China University of Technology State Key Laboratory of Supramolecular Structure and Materials Jilin University

Compositing gold nanoparticles into conjugated molecules have been developed to be one of the most important approaches to increase stability, since degradation of conjugated materials is now one of the biggest bottle-necks to be conquered before industrialization application. Big-size colloidal gold nanoparticles with strong surface plasma resonance are designed to composite with conjugated molecules, in order to realize effective fluorescence enhancement and stabilization. The uniform composition film of hydrophilic colloidal gold nanoparticles (particle diameter of 30 nm) and hydrophobic carbazole functionalized fluorene trimers has been obtained by direct mixing of their aqueous and THF solutions, which is determined by AFM. By the comparison of composition based on fluorene trimers with similar structures, we have found that peripheral carbazole group and molecular size of fluorene trimers play an important role in the balance of incompatible solubility, which is regarded as increasing solubility of fluorene trimers in mixed solvent, connecting AuNP and peripheral carbazole groups, and restraining aggregate of gold nanoparticle. This allows facile hydrophilic gold nanoparticle to disperse uniformly in hydrophobic-conjugated host. Our investigations show that fluorescence intensity of composition film is enhanced by 4 folds, and heat treatment (200°C for 4h) for the composition film does not induce the degradation of conjugated backbone without the appearance of low-energy emission band, demonstrating the prominent potency of gold nanoparticles in enhanced fluorescence and stability of conjugated molecules and polymers.

关键词：金纳米粒子亲水性胶体荧光增强均匀分散三聚体稳定性薄膜咔唑

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聚集诱导发光分子的光电功能与器件应用

中国科学：化学 2013年第9期43卷 1065-1077页

作者：越柏玲解增旗路萍马於光吉林大学超分子结构与材料国家重点实验室长春130012 华南理工大学发光材料与器件国家重点实验室广州510640

光电功能分子通常以薄膜和聚集体的形式显示功能,聚集诱导发光(AIE)分子体系的发现为解决固态下聚集诱导荧光猝灭(ACQ)难题提供了新的思路.本文总结了近年来本课题组发展的一系列AIE分子,侧重介绍这些AIE分子的光电功能与器件应用,特别... 详细信息

光电功能分子通常以薄膜和聚集体的形式显示功能,聚集诱导发光(AIE)分子体系的发现为解决固态下聚集诱导荧光猝灭(ACQ)难题提供了新的思路.本文总结了近年来本课题组发展的一系列AIE分子,侧重介绍这些AIE分子的光电功能与器件应用,特别是在有机电致发光器件和有机激光方面的应用.AIE材料显示非常高的电致发光效率,在显示与白光器件方面潜力巨大.在发展电泵有机激光方面,AIE材料特点突出,是最有前景的一类材料.

关键词：聚集诱导发光 PPV小分子发光器件有机激光双光子激光

金纳米粒子表面等离子体共振对有机发光二极管性能的提升

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金纳米粒子表面等离子体共振对有机发光二极管性能的提升

第十八届全国光散射学术会议

作者：刘琳琳吴小龑马於光华南理工大学发光材料与器件国家重点实验室

＜正＞有机/聚合物发光二极管在平板照明和显示等方面有重要应用前景,并且具有成本低和制备过程简单等优点,近年来受到格外重视。提高电致发光效率以及提高发光的稳定性是当前的研究重点。新兴纳米材料以其特殊的尺寸效应具有单分子和...

＜正＞有机/聚合物发光二极管在平板照明和显示等方面有重要应用前景,并且具有成本低和制备过程简单等优点,近年来受到格外重视。提高电致发光效率以及提高发光的稳定性是当前的研究重点。新兴纳米材料以其特殊的尺寸效应具有单分子和体材料都没有的特殊性能。实验中观察到,当用金属纳

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拉曼光谱原位表征在有机光电器件中的应用

光散射学报 2016年第3期28卷 195-202页

作者：王聪周学宏王蓉刘琳琳解增旗马於光华南理工大学发光材料与器件国家重点实验室华南理工大学材料学院广州510641

拉曼原位表征(Raman in situ characterization)就是在不破坏样品的情况下利用拉曼光谱实时监测变化过程,以表征样品在真实环境下的结构性能变化或记录样品在整个过程中的实时信息。在器件的工作时,原位检测化学结构、物理结构的变化,... 详细信息

拉曼原位表征(Raman in situ characterization)就是在不破坏样品的情况下利用拉曼光谱实时监测变化过程,以表征样品在真实环境下的结构性能变化或记录样品在整个过程中的实时信息。在器件的工作时,原位检测化学结构、物理结构的变化,有利于深入了解器件微观结构与光电性能间的关系,帮助我们优化器件结构,提高器件性能。本文主要针对有机光电器件,总结原位观察生长、老化、带电状态的特点和规律,探讨了原位拉曼光谱在有机光电器件原位表征中的应用和发展潜力。

关键词：拉曼光谱原位表征有机光电电掺杂态