基于新型蓝色荧光材料MQAB与红色磷光材料构建白色有机电致发光器件研究
发布时间：2019-06-05 17:48
【摘要】：白色有机电致发光器件(White Organic Light-emitting Diodes, WOLEDs)具备驱动电压低、效率高、功耗低、可柔性等优点,在固态照明及作为液晶背光源领域已取得了大量深入的研究并取得了快速的发展,被认为是下一代的高效、节能、环保的绿色光源。本论文研究的主要内容有： 1)首先探讨了所制备的单层蓝色荧光材料的单色器件的掺杂浓度影响,发现所获得的光谱在550nm-600nm波段的光强随浓度增强而增强,而该波段的发光并不来自于蓝色发光材料,经验证该波段发光产生于MQAB与NPB之间的激基复合物,然后利用该激基复合物光谱很好地展宽了MQAB的光谱,制备出了基于激基复合物发光的荧磷混合式白光器件,色坐标稳定且更接近(0.33,0.33),亮度和发光效率都大大提升,该研究解决了利用两种发光材料仍可获得优于三基色的宽光谱的白光器件,同时所制备器件的结构简易,大大降低了制备成本的问题。 2)此外,制备了基于新型蓝绿色荧光MQAB与红色磷光Ir(MDQ)2acac的荧磷混合式白色有机电致发光器件,并探讨了由TPBI或UGH3两种间隔层及二者的混合间隔层对该类型发光器件性能的影响。研究发现,采用TPBI和UGH3的混合间隔层可以调控载流子注入与传输的平衡,当TPBI:UGH3=1:1时,可有效地控制发光区域,使得器件性能得到优化,并获得发光亮度高达14700cd/m2的白色有机电致发光器件,最高电流效率可达11.60cd/A,且器件具有较高的色稳定性。采用混合间隔层的器件比单用TPBI或UGH3作为间隔层的器件效率提高了200-300%。 3)最后,制备了多个基于全磷光双波段有机电致发光器件,探讨了各器件产生不同光色的发光机理,通过控制各材料之间的掺杂浓度来控制能量转移,利用不完全能量转移,从而控制了器件的发光光色,设计出了多组分共混的单发光层结构,获得了色坐标稳定的纯白光。本研究巧妙利用多种材料之问的能量传递关系来调控激子控制发光光色,获得了稳定纯白光,同时解决了当前磷光器件普遍存在的激子难以控制的问题。
[Abstract]:White organic light-emitting device (White Organic Light-emitting Diodes, WOLEDs) has the advantages of low driving voltage, high efficiency, low power consumption, flexibility and so on. In the field of solid-state lighting and as liquid crystal backlight source, a lot of in-depth research has been made and rapid development has been made. It is considered to be the next generation of efficient, energy-saving and environmentally friendly green light source. The main contents of this paper are as follows: 1) firstly, the effect of doping concentration on the monochromatic devices of monolayer blue fluorescent materials is discussed, and it is found that the intensity of the obtained spectra in 550nm-600nm band increases with the increase of concentration. However, the emission of the band does not come from the blue luminous material. It has been proved that the band is generated from the excimer complex between MQAB and NPB, and then the spectrum of MQAB is well broadened by using the excimer complex spectrum. A fluorescent phosphorus hybrid white light device based on excimer complex has been fabricated. The color coordinates are stable and closer (0.33, 0.33). The brightness and luminous efficiency are greatly improved. This study solves the problem that white light devices with wide spectrum better than three primary colors can still be obtained by using two kinds of luminous materials. At the same time, the structure of the devices is simple and the fabrication cost is greatly reduced. 2) in addition, a new type of fluorescent phosphorus hybrid white organic electroluminescent device based on new blue-green fluorescent MQAB and red phosphorescence Ir (MDQ) 2acac was fabricated. The effects of two kinds of spacer layers, TPBI or UGH3, and their mixed spacers on the performance of this type of light-emitting devices are also discussed. It is found that the mixed spacer layer of TPBI and UGH3 can control the balance of carrier injection and transmission. When TPBI:UGH3=1:1, the luminous region can be effectively controlled, and the performance of the device can be optimized. The white organic electroluminescent device with luminous brightness as high as 14700cd/m2 is obtained. the highest current efficiency can reach 11.60CD 鈮，
本文编号：2493711
[Abstract]:White organic light-emitting device (White Organic Light-emitting Diodes, WOLEDs) has the advantages of low driving voltage, high efficiency, low power consumption, flexibility and so on. In the field of solid-state lighting and as liquid crystal backlight source, a lot of in-depth research has been made and rapid development has been made. It is considered to be the next generation of efficient, energy-saving and environmentally friendly green light source. The main contents of this paper are as follows: 1) firstly, the effect of doping concentration on the monochromatic devices of monolayer blue fluorescent materials is discussed, and it is found that the intensity of the obtained spectra in 550nm-600nm band increases with the increase of concentration. However, the emission of the band does not come from the blue luminous material. It has been proved that the band is generated from the excimer complex between MQAB and NPB, and then the spectrum of MQAB is well broadened by using the excimer complex spectrum. A fluorescent phosphorus hybrid white light device based on excimer complex has been fabricated. The color coordinates are stable and closer (0.33, 0.33). The brightness and luminous efficiency are greatly improved. This study solves the problem that white light devices with wide spectrum better than three primary colors can still be obtained by using two kinds of luminous materials. At the same time, the structure of the devices is simple and the fabrication cost is greatly reduced. 2) in addition, a new type of fluorescent phosphorus hybrid white organic electroluminescent device based on new blue-green fluorescent MQAB and red phosphorescence Ir (MDQ) 2acac was fabricated. The effects of two kinds of spacer layers, TPBI or UGH3, and their mixed spacers on the performance of this type of light-emitting devices are also discussed. It is found that the mixed spacer layer of TPBI and UGH3 can control the balance of carrier injection and transmission. When TPBI:UGH3=1:1, the luminous region can be effectively controlled, and the performance of the device can be optimized. The white organic electroluminescent device with luminous brightness as high as 14700cd/m2 is obtained. the highest current efficiency can reach 11.60CD 鈮，
本文编号：2493711
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