雙偶極主體材料的設計、合成及電致發(fā)光性質(zhì)
[Abstract]:The phosphorescent organic electroluminescent device (PhOLEDs) and the delayed fluorescent electroluminescent device (TADF-OLED) have become a hot spot in the field of OLEDs due to the fact that the singlet state and the triplet exciton can be used 100% compared to the conventional fluorescent device. The typical PhOLEDs and TADF-OLEDs adopt the device structure doped with the main guest material, and the main material of the main component of the light-emitting layer plays a decisive role in the comprehensive performance of the device, so that the main material and the light-emitting material are of equal importance. The research has shown that the dual-dipole body material can effectively balance the positive and negative carrier transmission, not only can improve the light-emitting efficiency of the OLED device, but also effectively reduce the efficiency attenuation. However, there are no mature methods and theories for molecular design, especially the choice of n-type groups with electron transport function and the matching with p-type groups. In view of the current situation in this field, two types of "single n-type" and "double-n-type" are prepared by adjusting the type, proportion, and connection mode of n-type group, and five series of main body materials are prepared and used for preparing high-efficiency PhOLEDs and TADF-OLEDs. The relationship between the structure and the properties of the cyano (CN) is studied, in particular the following: (1) a cyano (CN)-containing "single n-type" host material: a CN-substituted phenyl group as an electron transport group, and a phenyl disulfide as a hole transport group to prepare three main body materials of o-CzCN, m-CzCN and p-CzCN, The triplet energy level and the carrier transport capacity of the molecule are successfully adjusted by transforming the connection mode between the IGRP and the central core o, m and the pair. in which, the maximum current efficiency of the blue phosphorescent device is 46.81cd A-1 (the maximum external quantum efficiency is 23.14%) with the m-CzCN as the main material, and the maximum external quantum efficiency of the blue delayed fluorescent device doped with the o-CzCN as the main material is 14.98%, Higher than 2CzPN at that time, the highest value was 13.6%. (2) a single n-type "main material with a high triplet state: a series of double-dipole main body materials o-CzDPz, m-CzDPz, 3-CzDPz and mCPDPz are applied to blue and green PhOLEDs and TADF-OLEDs, respectively. It is found that the molar ratio of n/ p groups is 2:1, which is most favorable for charge balance, and the m-CzDPz of m-CzDPz as the main material and the green PhOLEDs of 3-CzDPz as the main material obtain 26.8% and 29.0% high external quantum efficiency, respectively. More particularly, the green TADF-OLEDs of this series of host materials have a low efficiency roll-off. (3) the "double-n-type" main material containing the cyanamide is introduced into a benzene ring or a benzene ring of the mCP framework of the traditional host material by taking the cyanoacrylate as a "double-n-type" group, and the new main body materials m-PyCNmCP and 3-PyCNmCP are respectively obtained, and are applied to the green PhOLEDs, The power efficiency of the starting voltage of 2.01 V and 2.27 V (corresponding to the luminance of 1 cd m-2) and the power efficiency of 101.4 lm W-1 and 119.3 lm W-1 were obtained, respectively. The light-on voltage is lower than the lowest theoretical voltage of the green device with Ir (ppy)3 as the guest material, and 2.01 V is close to the lowest light-on voltage of the Ir (ppy)3 device to date 1.97 V. (4) The "double-n-type"-body material containing the vivacizumab as the "double-n-type" electron transport group, The bi-polar body materials o-CzPyPz, m-CzPyPz and p-CzPyPz are prepared, and the properties of the triplet energy and the charge transport capacity of the molecules are adjusted by changing the connection mode of the pairs of the molecules. The maximum efficiency and low efficiency roll-off of 49.1 cd A-'(24.5%) were obtained with the blue phosphorescent device of m-CzPyPz as the main material. The maximum efficiency of 91.8 cd A-1 (27.3%) was obtained with the green phosphorescent device of p-CzPyPz as the main material. The efficiency of 57.8 cd A-1 (23.6%) and 60.7 cd A-1 (23.1%) was obtained with m-CzPyPz and p-CzPyPz as the main material. (5) The main material of the "double-n-type" main body with the dibenzo-phenyl-base is the "double-n-type" group, which is introduced into different positions of the mCP framework, and the two dipole body materials w-PyPOmCP and p-PyPOmCP are prepared. Compared with the reference molecule PymCP containing only the same, and the n-type group is connected to the p-type group, the double-n-type "group is adopted, and the double-n-type" group is directly connected, so that not only the LUMO energy level of the molecule is effectively reduced, but also the higher HOMO energy level is ensured, Thereby simultaneously promoting the injection and transmission of positive and negative carriers. The maximum efficiency of the blue phosphorescent device with m-PyPOmCP as the main material is 55.6 cA-1 (25.3%), and the maximum efficiency of the green phosphorescent device with p-PyPOmCP as the main material is 98.2 cd A-1 (28.2%).
【學位授予單位】:大連理工大學
【學位級別】:博士
【學位授予年份】:2016
【分類號】:TQ422;TN383.1
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