基于具有热激活延迟荧光(TADF)的发射器的蓝色有机发光二极管(OLED)的高驱动电压仍然是其便携式应用的制约因素。这样做的主要原因是,匹配蓝色TADF发射器所需的主体的高三重态(T 1)总是会导致载流子注入方面的劣势。因此,合适的宿主不仅应具有较高的T 1,而且应具有相对较低的单线态(S 1),以改善载流子注入,这表明较小的单线态-三重态分裂(ΔE STs)是非常需要的。在此,以一步法轻松制备了四种咔唑基苄腈衍生物,具有受限的共轭长度,以维持高三重态能量,同时其高度扭曲的结构在空间上分隔了前沿轨道分布,从而实现了相对较低的ΔE ST s。同时,通过宿主部分的不同接头类型有效地调节了这些宿主的电荷输送能力。因此,实现了具有良好的载流子注入/传输能力的高三重态能量宿主,赋予蓝色TADF器件最大外部量子效率21.5%,最大功率效率42.0 lm W -1值得注意的是,在1000 cd m -2的实际亮度下,驱动电压为4
Rational Molecular Design for Deep‐Blue Thermally Activated Delayed Fluorescence Emitters
作者:Chin‐Yiu Chan、Lin‐Song Cui、Jong Uk Kim、Hajime Nakanotani、Chihaya Adachi
DOI:10.1002/adfm.201706023
日期:2018.3
of the functional groups on the donor unit, the thermallyactivateddelayedfluorescence (TADF) properties of emitters can easily be manipulated. A series of deepblue to blue emissive TADF derivatives is developed, capable of deep‐blue emissions from 403 to 460 nm in toluene. Deep‐blueorganiclight‐emittingdiodes (OLEDs) based on this series of TADF emitters are fabricated, resulting in an electroluminescence
通过简单修饰供体单元上的官能团,可以轻松操纵发射体的热激活延迟荧光(TADF)特性。已开发出一系列深蓝色至蓝色发射的TADF衍生物,能够在甲苯中从403 nm到460 nm发射深蓝光。基于该系列TADF发射器的深蓝色有机发光二极管(OLED)得以制造,从而在428 nm处产生电致发光峰,并具有高达10.3%的高外部量子效率。一种深蓝色OLED已达到(0.156,0.063)的国际照明委员会(CIE)坐标,这是CIE y <0.07的深蓝色OLED报告的最佳TADF性能之一。
An organic electroluminescent device includes a pair of electrodes; and an organic layer between the pair of electrodes, which comprises a light-emitting layer and contains a compound represented by the following formula (1):
wherein each of R1 to R8 independently represents a hydrogen atom or a substituent, A represents an aromatic ring which may have a substituent, m represents an integer of 2 or greater, and n represents an integer of 1 or greater.
Material for organic electroluminescence device and organic electroluminescence device
申请人:UDC IRELAND LIMITED
公开号:US10243153B2
公开(公告)日:2019-03-26
A material for an organic electroluminescence device, includes: an organic material that is to be provided for a film formation of any of at least one organic layer included in the organic electroluminescence device, the organic material having a water content before the film formation, as measured by the Karl Fischer method, of 100 ppm or more and not more than 1,000 ppm.
An organic electroluminescence device having high efficiency, low in driving voltage and excellent in durability and a compound useful for the organic electroluminescence device are provided.
An organic electroluminescence device comprising, a substrate having thereon: a pair of electrodes of an anode and a cathode; and at least one organic layer comprising a light-emitting layer between the pair of electrodes, and the light-emitting layer contains at least one kind of a phosphorescent material, and at least either one layer of the at least one organic layer contains a specific compound having a dibenzothiophene or dibenzofuran structure, and the compound.