具有D-π-A結(jié)構(gòu)的藍(lán)色發(fā)光材料的制備及性能研究
發(fā)布時間：2018-10-08 15:01
【摘要】：有機電致發(fā)光器件(OLED)與其他顯示相比具有主動發(fā)光、低驅(qū)動電壓、全視角、響應(yīng)快、工作溫度范圍寬、可柔性顯示等優(yōu)點被認(rèn)為是下一代顯示技術(shù)的主流。在OLED全彩顯示和固態(tài)照明領(lǐng)域,特別是白色OLED,需要通過紅、綠、藍(lán)三基色或者藍(lán)與橙兩種顏色組成。但是藍(lán)光發(fā)射需要較高的激發(fā)能,引起能量轉(zhuǎn)移,從而引起色度不足。因此高效藍(lán)色發(fā)光材料是限制藍(lán)光OLED的瓶頸,這就要求對藍(lán)光熒光材料的設(shè)計和合成有一定的策略。本文圍繞芴基團、蒽基團為中心核設(shè)計和制備了藍(lán)光材料。本論文的主要工作如下:(1)設(shè)計和制備了A-D-A結(jié)構(gòu),由炔基相連芴的菲并咪唑化合物FI,作為無摻雜的藍(lán)光OLED的發(fā)光層。該化合物在244℃出現(xiàn)吸熱熔融峰,其Td為426℃,表明具有良好的熱穩(wěn)定性。UV-vis計算得到FI的帶隙大于3.0 e V,符合藍(lán)光材料對寬帶隙的要求。理論計算發(fā)現(xiàn)該分子呈現(xiàn)扭曲空間結(jié)構(gòu),能夠很好的抑制分子在薄膜中相互作用,抑制其激基復(fù)合物或激基締合物的形成。最后以FI為發(fā)光層通過濕法加工制備了非摻雜的單層OLED。通過添加TPBi,器件的最大CE為3.0 cd?A-1,最大PE為1.7 lm?W-1。本分子設(shè)計策略為可濕法加工的以芴基團為基礎(chǔ)的藍(lán)光OLED提供了一種新的合成理念。(2)設(shè)計合成了以蒽為核的含三苯胺基團的藍(lán)光發(fā)光材料DTPAAN和DTPABAN。通過TG、UV-vis和PL分析了材料的熱穩(wěn)定性及光學(xué)性能�；衔顳TPAAN和DTPABAN,Td分別為378℃、390℃,具有良好的熱穩(wěn)定性。通過UV-vis計算,發(fā)現(xiàn)DTPAAN與DTPABAN的帶隙都大于3.0 e V,滿足藍(lán)光材料對寬帶隙的要求。將中心核由蒽換為聯(lián)蒽,發(fā)現(xiàn)在固態(tài)狀態(tài)下熒光發(fā)射峰沒有明顯的偏移,這可能是分子內(nèi)電荷轉(zhuǎn)移態(tài)的扭曲構(gòu)型導(dǎo)致了低熒光過渡態(tài)。因為兩個蒽的二面角的角度會隨著分子偶極矩的改變而不同。理論計算發(fā)現(xiàn)分子呈現(xiàn)扭曲空間結(jié)構(gòu),能夠很好的抑制分子在薄膜中相互作用,進而抑制其激基復(fù)合物或激基締合物的形成。因此,DTPAAN和DTPABAN應(yīng)屬于藍(lán)光發(fā)光材料。(3)設(shè)計并合成了含有螺二芴、蒽和三苯胺基團的分子結(jié)構(gòu)為D-A-D-A-D的新型藍(lán)色熒光材料DTPAAN-SF。該化合物Td為505℃,具有良好的熱穩(wěn)定性。通過UV-vis計算,發(fā)現(xiàn)DTPAAN-SF的帶隙大于3.0 e V,滿足藍(lán)光材料對寬帶隙的要求。薄膜的PL峰為474 nm,其EL譜應(yīng)該與其相一致。因此,DTPAAN-SF應(yīng)屬于藍(lán)光發(fā)光材料。
[Abstract]:Compared with other displays, organic electroluminescent devices (OLED) have the advantages of active luminescence, low driving voltage, full angle of view, fast response, wide range of operating temperature, flexible display and so on, which are considered to be the mainstream of the next generation display technology. In the field of OLED full color display and solid state lighting, white OLED, is made up of red, green and blue primary colors or blue and orange colors. However, blue emission requires high excitation energy, which leads to energy transfer, which leads to chroma deficiency. Therefore, high efficient blue luminescent materials are the bottleneck of limiting blue OLED, which requires a certain strategy for the design and synthesis of blue fluorescent materials. Blue light materials were designed and prepared around fluorene group with anthracene group as the core. The main work of this thesis is as follows: (1) the structure of A-D-A was designed and prepared, and FI, a benzyl linked fluorene compound, was used as the luminescent layer of undoped blue-light OLED. The endothermic melting peak of the compound appeared at 244 鈩，
本文編號：2257203
[Abstract]:Compared with other displays, organic electroluminescent devices (OLED) have the advantages of active luminescence, low driving voltage, full angle of view, fast response, wide range of operating temperature, flexible display and so on, which are considered to be the mainstream of the next generation display technology. In the field of OLED full color display and solid state lighting, white OLED, is made up of red, green and blue primary colors or blue and orange colors. However, blue emission requires high excitation energy, which leads to energy transfer, which leads to chroma deficiency. Therefore, high efficient blue luminescent materials are the bottleneck of limiting blue OLED, which requires a certain strategy for the design and synthesis of blue fluorescent materials. Blue light materials were designed and prepared around fluorene group with anthracene group as the core. The main work of this thesis is as follows: (1) the structure of A-D-A was designed and prepared, and FI, a benzyl linked fluorene compound, was used as the luminescent layer of undoped blue-light OLED. The endothermic melting peak of the compound appeared at 244 鈩，
本文編號：2257203
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