基于新型藍色熒光材料MQAB與紅色磷光材料構建白色有機電致發(fā)光器件研究
發(fā)布時間：2019-06-05 17:48
【摘要】：白色有機電致發(fā)光器件(White Organic Light-emitting Diodes, WOLEDs)具備驅動電壓低、效率高、功耗低、可柔性等優(yōu)點,在固態(tài)照明及作為液晶背光源領域已取得了大量深入的研究并取得了快速的發(fā)展,被認為是下一代的高效、節(jié)能、環(huán)保的綠色光源。本論文研究的主要內(nèi)容有： 1)首先探討了所制備的單層藍色熒光材料的單色器件的摻雜濃度影響,發(fā)現(xiàn)所獲得的光譜在550nm-600nm波段的光強隨濃度增強而增強,而該波段的發(fā)光并不來自于藍色發(fā)光材料,經(jīng)驗證該波段發(fā)光產(chǎn)生于MQAB與NPB之間的激基復合物,然后利用該激基復合物光譜很好地展寬了MQAB的光譜,制備出了基于激基復合物發(fā)光的熒磷混合式白光器件,色坐標穩(wěn)定且更接近(0.33,0.33),亮度和發(fā)光效率都大大提升,該研究解決了利用兩種發(fā)光材料仍可獲得優(yōu)于三基色的寬光譜的白光器件,同時所制備器件的結構簡易,大大降低了制備成本的問題。 2)此外,制備了基于新型藍綠色熒光MQAB與紅色磷光Ir(MDQ)2acac的熒磷混合式白色有機電致發(fā)光器件,并探討了由TPBI或UGH3兩種間隔層及二者的混合間隔層對該類型發(fā)光器件性能的影響。研究發(fā)現(xiàn),采用TPBI和UGH3的混合間隔層可以調(diào)控載流子注入與傳輸?shù)钠胶?當TPBI:UGH3=1:1時,可有效地控制發(fā)光區(qū)域,使得器件性能得到優(yōu)化,并獲得發(fā)光亮度高達14700cd/m2的白色有機電致發(fā)光器件,最高電流效率可達11.60cd/A,且器件具有較高的色穩(wěn)定性。采用混合間隔層的器件比單用TPBI或UGH3作為間隔層的器件效率提高了200-300%。 3)最后,制備了多個基于全磷光雙波段有機電致發(fā)光器件,探討了各器件產(chǎn)生不同光色的發(fā)光機理,通過控制各材料之間的摻雜濃度來控制能量轉移,利用不完全能量轉移,從而控制了器件的發(fā)光光色,設計出了多組分共混的單發(fā)光層結構,獲得了色坐標穩(wěn)定的純白光。本研究巧妙利用多種材料之問的能量傳遞關系來調(diào)控激子控制發(fā)光光色,獲得了穩(wěn)定純白光,同時解決了當前磷光器件普遍存在的激子難以控制的問題。
[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，
本文編號：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，
本文編號：2493711
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