合理设计并成功合成了一系列新的热引发的可自交联的二芳基芴基共聚物,旨在提高蓝色发光二极管的效率和稳定性。侧链中的交联基团使这些共聚物具有出色的耐溶剂性和抗氧化能力,这已通过拉曼和紫外可见吸收以及可变温度光致发光光谱进行了验证。与没有交联的原始膜的0.68nm的粗糙度相比,热自交联共聚物膜的表面粗糙度几乎没有变化,具有0.73nm的低值。通过计算和实验分析了有/没有交联反应的共聚物能级的调节。与未交联共聚物膜相比,热自交联共聚物膜的最高占据分子轨道(HOMO)能级上移了约0.1 eV,这有助于建立从阳极注入空穴的更好途径。最后,外部量子效率高达4.29%,最大亮度为7491 cd m通过使用热交联共聚物发射器,可以使优化的蓝色聚合物发光二极管(PLED)达到−2,这是迄今为止在自交联蓝色荧光发射器领域中报道的最高效率。这项工作表明,远离蓝色聚合物主链的自交联侧链单元的引入是开发高效且稳定的蓝色PLED的非常有前途的策略。
Electroluminescent materials grafted with charge transport moieties having graded ionization potential or electrophilic property and their application in light-emitting diodes
申请人:Chen Show-An
公开号:US20090066238A1
公开(公告)日:2009-03-12
This invention provides new electroluminescent materials such as a conjugated polymer or a phosphorescent organometallic complex, which are grafted with multiple charge transport moieties with graded ionization potential or electrophilic property. The charge transport moieties can be all hole transport moieties or all electron transport moieties. The emissive electroluminescent materials covering the full visible range can be prepared. Organic light emitting diodes prepared with these materials can be used as indicators, light source and display for cellular phones, digital camera, pager, portable computer, personal data acquisition (PDA), watch, hand-held videogame, and billboard, etc.
Significantly improved photovoltaic performances of the dithiophene-benzothiadiazole-<i>alt</i>
-fluorene copolymers by incorporating carbazole units in fluorene moiety
exploit an effective way to improve polymeric photovoltaicperformance, a series of dithiophene‐benzothiadiazole‐alt‐fluorenecopolymers containing carbazole groups at C‐9 positions of the alternating fluoreneunits (PFO‐FCz‐DBT) were synthesized and characterized. The effect of the carbazole groups on the optophysical, electrochemical, and photovoltaic properties of these copolymers was investigated. By
polymer light-emittingdiode (PLED) with the use of a thermal crosslinking copolymer emitter, which is the highest efficiency reported so far in the field of self-crosslinking blue fluorescent emitters. This work demonstrates that the introduction of self-crosslinkable side-chain units far from the blue polymer backbone is a very promising strategy for developing highly efficient and stable blue PLEDs
合理设计并成功合成了一系列新的热引发的可自交联的二芳基芴基共聚物,旨在提高蓝色发光二极管的效率和稳定性。侧链中的交联基团使这些共聚物具有出色的耐溶剂性和抗氧化能力,这已通过拉曼和紫外可见吸收以及可变温度光致发光光谱进行了验证。与没有交联的原始膜的0.68nm的粗糙度相比,热自交联共聚物膜的表面粗糙度几乎没有变化,具有0.73nm的低值。通过计算和实验分析了有/没有交联反应的共聚物能级的调节。与未交联共聚物膜相比,热自交联共聚物膜的最高占据分子轨道(HOMO)能级上移了约0.1 eV,这有助于建立从阳极注入空穴的更好途径。最后,外部量子效率高达4.29%,最大亮度为7491 cd m通过使用热交联共聚物发射器,可以使优化的蓝色聚合物发光二极管(PLED)达到−2,这是迄今为止在自交联蓝色荧光发射器领域中报道的最高效率。这项工作表明,远离蓝色聚合物主链的自交联侧链单元的引入是开发高效且稳定的蓝色PLED的非常有前途的策略。