【作者】 王坤；

【导师】 徐叙瑢； 徐征；

【作者基本信息】 北京交通大学 ， 光学工程（专业学位）， 2019， 硕士

【摘要】 磷光有机电致发光器件(PhOLEDs)可通过增加前沿轨道的重金属成分打破自旋禁阻,促进激子的辐射跃迁,理论上能达到100%的内量子效率。然而国内外对于磷光材料器件的研究集中在铱金属配合物上,对铂金属配合物磷光材料及其器件的研究较少。本论文主要研究了新型铂金属配合物磷光材料的电化学及光物理特性,以及其在不同主客体结构器件中的发光机制。主要内容有:首先,本论文研究了新型同系列铂金属配合物Pt0和Pt4的电化学特性、光致和电致发光特性以及材料热稳定性,并研究了两种新型磷光材料在不同掺杂浓度下的器件性能。材料Pt0和Pt4的电致发光波长均为520 nm。我们发现在20 mA/cm2电流密度下,同浓度条件下Pt0的器件电压7.16 V,电流效率19.19 cd/A,Pt4的器件电压6.84 V,电流效率32.64 cd/A。Pt4是一种优良的单色绿光OLED客体材料,而Pt0在高浓度条件下发光层内部形成了波长为648 nm的激基缔合物,若将其与短波长蓝光材料混合,则可用于白光器件制备。其次,我们将新型材料Pt4分别与三种不同主体材料TCTA、E228和E258掺杂制备发光层,研究了主体材料、传输层材料和厚度对基于新型铂金属配合物Pt4的OLEDs器件性能的影响。通过对器件光谱、电压和电流效率等数据进行分析,我们发现主体材料为E258在掺杂浓度为15 wt%,发光层厚度为15 nm时,器件的整体性能最好。在20 mA/cm2电流密度下,该器件电压值为5.6 V,电流效率达到 50.65 cd/A,亮度 10010 cd/m2。最后,我们研究了不同主客体掺杂及功能层对器件稳定性的影响机制。我们发现器件材料能级适配性,载流子传输平衡及发光层与电极之间的距离均会对器件的寿命产生较大的影响。更多还原

【Abstract】 Phosphorescent organic electroluminescent devices(PhOLEDs)can break the spin-forbidden by increasing the heavy metal composition of the frontier orbit,and promote the exciton radiation transition to achieve 100%internal quantum efficiency.However,researches phosphorescent material of the device is focused on iridium complexes,platinum complexes few studies on the phosphorescent materials and devices.In this thesis,the electrochemical and photophysical properties of novel platinum metal complex phosphorescent materials and their luminescence mechanisms in different host-guest structures are studied.The main research contents are as follows:Firstly,the thesis studies the electrochemical properties,photo and electroluminescence properties and thermal stability of the new platinum metal complexes Pt0 and Pt4,and discusses the different doping device performance of two new phosphorescent materials.The electroluminescent wavelengths of the materials Pt0 and Pt4 are both 520 nm.At the current density of 20 mA/cm2,we found that the device voltage of doped PtO is 7.16 V,the current efficiency is 19.19 cd/A,the voltage of the device doped with Pt4 is 6.84 V,and the current efficiency is 32.64 cd/A.Pt4 is an excellent monochromatic green OLED guest material,and under high concentration conditions,Pt0 forms an excimer at a wavelength of 648 nm in the light-emitting layer of the device.If it is mixed with a short-wavelength blue light material,it has the potential of a white device.Secondly,we have made the new material Pt4 doped with three different host materials TCTA,E228 and E258 to form the light-emitting layer,and we studied the effects of host material,transport layer material and thickness on the performance of OLEDs based on platinum metal complex Pt4.By analyzing the data of its spectrum,efficiency and stability,we found that the material E258 has the best overall performance when the doping concentration is 15 wt%and the thickness of the luminescent layer is 15 nm.At a current density of 20 mA/cm2,the device voltage is 5.6 V,the current efficiency is 50.65 cd/A,and the luminance is 10010 cd/m2.Finally,we studied the effects of different host-guest doping and functional layers on device stability.We have found that the device material energy level adaptability,the carrier transport balance,and the distance between the luminescent layer and the electrode all have a large effect on the lifetime of the device.更多还原