环金属铂配合物近红外发光和白光器件的性能优化研究

发布时间：2018-05-05 08:17

本文选题：聚合物电致发光器件 + 近红外发光　；参考：《湘潭大学》2017年硕士论文

【摘要】：近红外发光材料(波长700-2500 nm)在不可见光区域的优良抗干扰特性,使其在传感和信息检测方面具有独特优势。近几年,随着信息安全、化学传感和夜视装备的快速发展,将有机电致发光二极管(OLEDs)的发射波长从可见光延长到近红外区域,并利用近红外与蓝光复合发光实现暖白光照明已成为有机电致发光一个新的发展目标。环金属铂配合物理论上具有100%的内量子效率,为高效近红外电致发光器件的实现提供了可能。目前NIR-OLEDs的最大外量子效率一般是在较低的电流密度下得到的,且随着电流密度的升高,存在严重的滚降现象。与NIR-OLEDs器件相比,近红外聚合物电致发光二极管(NIR-PLEDs)具有器件加工工艺简单,易实现柔性器件等优点,近年备受研究者的青睐,但其发光性能仍低于NIR-OLEDs器件。为解决NIR-PLEDs发光效率差、辐照度不高等关键问题,并进一步拓展近红外发光材料在健康固态照明方面的应用,本论文开展了环金属铂配合物近红外发光器件和白光器件的性能优化研究。主要研究内容及结论如下:1.以我们自己合成的近红外有机环金属铂配合物(niq)2Pt2(μ-C8PhOXT)2为掺杂客体材料,非共轭聚合物聚乙烯咔唑(PVK)或共轭聚合物聚9,9-(二辛基)芴(PFO)为主体材料,构筑了有机环金属铂配合物NIR-PLEDs器件,研究了不同主体材料分子结构和不同器件结构对NIR-PLEDs器件性能的影响。结果发现当PFO:OXD-7为主体,(niq)2Pt2(μ-C8PhOXT)2掺杂浓度为8 wt%时,其NIR-PLEDs器件的最大外量子效率(EQEmax)为6.18%,最大辐照度为903μW/cm2。当以PVK:OXD-7为主体,(niq)2Pt2(μ-C8PhOXT)2掺杂浓度为2 wt%时,其NIR-PLEDs器件的EQEmax只有4.89%,最大辐照度下降至684μW/cm2。2.以PVK为主体材料,以天蓝光发射的双(4,6-二氟苯基吡啶-N,C2')吡啶甲酰合铱(FIrpic),深红-近红外光发射的(niq)2Pt2(μ-C8PhOXT)2为磷光掺杂客体材料,制作了基于天蓝-近红外双色光的聚合物电致白光二极管(WPLEDs)。当FIrpic:(niq)2Pt2(μ-C8PhOXT)2的掺杂比例为20:0.4时,器件的EQEmax为9.49%,色坐标(CIE)为(0.353,0.354),接近于标准白光CIE(0.333,0.333),但是其显色指数(CRI)较低(42),色温(CCT)较高(4806 K),难以满足于室内照明需求。为获得较低色温和高的WPLEDs器件,我们引入双(4-苯基噻吩[3,2-c]并吡啶-N,C2')乙酰丙酮合铱(PO-01)黄光材料,制作了基于FIrpic,PO-01和(niq)2Pt2(μ-C8PhOXT)2三色光的WPLEDs器件,当FIrpic:PO-01:(niq)2Pt2(μ-C8PhOXT)2的掺杂比例为20:0.2:0.7时,器件的最大外量子效率上升至10.60%,显色指数为87,色温3246 K,有效覆盖了450-780 nm范围内的可见光光谱。在此体系中,通过使用天蓝光材料FIrpic,避免了深蓝光对人体的伤害,解决了使用天蓝光材料造成的窄光谱覆盖问题。获得了基于溶液加工的高CRI且有益于人体健康的暖白光。
[Abstract]:Near-infrared luminescent materials (wavelength 700-2500 nm) have unique advantages in sensing and information detection due to their excellent anti-interference characteristics in invisible region. In recent years, with the rapid development of information security, chemical sensing and night vision equipment, the emission wavelength of electromechanical light-emitting diodes (OLEDs) has been extended from visible light to near infrared region. It has become a new development target for organic electroluminescence to realize warm white light illumination by using near infrared and blue light composite luminescence. The theoretical internal quantum efficiency of the ring metal platinum complexes is 100%, which provides the possibility for the realization of high efficiency near infrared electroluminescent devices. At present, the maximum external quantum efficiency of NIR-OLEDs is generally obtained at low current density, and with the increase of current density, there is a serious phenomenon of rolling down. Compared with NIR-OLEDs devices, Near-infrared polymer electroluminescent diodes (NIR-PLEDs) have many advantages such as simple fabrication process and easy to realize flexible devices. In recent years, Near-infrared polymer electroluminescent diodes (NIR-PLEDs) are favored by researchers, but their luminescence performance is still lower than that of NIR-OLEDs devices. In order to solve the key problems such as poor luminescence efficiency and low irradiance of NIR-PLEDs, the application of near-infrared luminescent materials in healthy solid-state lighting is further expanded. In this paper, the performance optimization of ring metal platinum complexes near infrared luminescent devices and white light devices has been studied. The main contents and conclusions are as follows: 1. An organocyclic platinum complex (NIR-PLEDs) device was fabricated by using our own Near-infrared organocyclic platinum complex (PFOs) (渭 -C8PhOXTt2 as doped guest material, non-conjugated polymer polyvinyl carbazole (PVK) or conjugated polymer poly (99-dioctyl) fluorene) as host material. The effects of molecular structure of different main materials and different device structures on the properties of NIR-PLEDs devices were studied. The results show that the maximum external quantum efficiency (EQEmax) of PFO:OXD-7 is 6.18 and the maximum irradiance is 903 渭 W / cm ~ (2) when the concentration of 渭 -C8PhOXTt2 is 8 wt%. When the doping concentration of PVK:OXD-7 is 2 wt%, the EQEmax of NIR-PLEDs device is only 4.89, and the maximum irradiance decreases to 684 渭 W / cm ~ (2.2). PVK was used as host material, difluorophenylpyridine difluorophenyl pyridyl formylpyridyl iridium (FIrpico) and photoluminescence doped guest material (渭 -C8PhOXTt2) were used as host materials. A polymer electroinduced white light diode (WPLEDsN) based on blue and near infrared double color light was fabricated. When the doping ratio of FIrpico: niqt2 (渭 -C8PhOXTt2) is 20: 0.4, the EQEmax of the device is 9.49, and the color coordinate is 0.353n0.354m, which is close to the standard white light CIEX 0.333n 0.3330.333, but its chromogenic index (CRI) is lower than that of the standard white light (CIEI), and the color temperature (CCT) is higher (4806Kg), so it is difficult to meet the indoor lighting demand. In order to obtain low color temperature and high color WPLEDs devices, we have fabricated WPLEDs devices based on FIrpico PO-01 (渭 -C8PhOXT2) trichromatic WPLEDs devices by using bis (4-phenyl-thiophene) and pyridyl (N-C) acetylacetylacetylacetone and iridium PO-01 (渭 -C8PhOXT2) yellow light materials. When the doping ratio of FIRIC: PO-01: niqOXTt2 (渭 -C8PhOXTt2) is 200.20.7, The maximum external quantum efficiency of the device is increased to 10.60. The chromogenic index is 87 and the color temperature is 3246 K. it effectively covers the visible spectrum in the range of 450-780 nm. In this system, the problem of narrow spectral coverage caused by the use of celestial blue light materials is solved by avoiding the harm caused by dark blue light to human body. Warm white light with high CRI based on solution processing and beneficial to human health was obtained.
【学位授予单位】：湘潭大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：O641.4

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