基于量子阱结构的混合型白光有机发光器件
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摘要
以荧光材料BePP2结合量子阱作为蓝光发射层,磷光材料GIrl和R-4B掺入到混合双极性主体材料CBP∶Bphen中分别作为绿、红发光层并且在红绿发光层中引入间隔层TPBI,组合得到发白光的混合型有机发光器件。其中量子阱是以BePP2作为势阱、TCTA为势垒。结果表明:当势垒层数为2时,器件的最大发光亮度和电流效率分别为21 682.5 cd/m2和23.73 cd/A;当电压从7 V增加到14 V时,色坐标从(0.345,0.350)变化到(0.340,0.342)。与无量子阱结构的参考器件相比,势垒层数为2的器件的最大功率效率为8.07 lm/W,色坐标变化相对最小为±(0.005,0.008),还有一个高的显色指数83。
Hybrid white organic light-emitting device based on fluorescent layer combining with phosphorescent doping layer was fabricated,in which fluorescent material BePP2 acted as blue emitter layer,phosphorescent material GIrl and R-4B doped into CBP∶ Bphen bipolar type host acted as green and red emitter layer,respectively. The ultrathin spacer layer was constructed by inserting a2. 0 nm thin layer of TPBI between red and green emitting layer. In the quantum well structure,BePP2 and TCTA acted as the potential well layer and the potential barrier layer,respectively. The maximum luminance and current efficiency are 21 682. 5 cd /m2 and 23. 73 cd /A,respectively. The Commission Internationale de I'Eclairage( CIE) coordinates of the device vary from( 0. 345,0. 350) at 7 V to(0. 340,0. 342) at 14 V when the number of potential barrier layer is two. In comparison with the reference device without quantum well structure,the device with two barrier layers achieves a maximum power efficiency of 8. 07 lm/W,a low CIE coordinates changing of ±(0. 005,0. 008),and a high color rendering index of 83.
Hybrid white organic light-emitting device based on fluorescent layer combining with phosphorescent doping layer was fabricated,in which fluorescent material BePP2 acted as blue emitter layer,phosphorescent material GIrl and R-4B doped into CBP∶ Bphen bipolar type host acted as green and red emitter layer,respectively. The ultrathin spacer layer was constructed by inserting a2. 0 nm thin layer of TPBI between red and green emitting layer. In the quantum well structure,BePP2 and TCTA acted as the potential well layer and the potential barrier layer,respectively. The maximum luminance and current efficiency are 21 682. 5 cd /m2 and 23. 73 cd /A,respectively. The Commission Internationale de I'Eclairage( CIE) coordinates of the device vary from( 0. 345,0. 350) at 7 V to(0. 340,0. 342) at 14 V when the number of potential barrier layer is two. In comparison with the reference device without quantum well structure,the device with two barrier layers achieves a maximum power efficiency of 8. 07 lm/W,a low CIE coordinates changing of ±(0. 005,0. 008),and a high color rendering index of 83.
引文
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[3]An T,Xia Y F,Nan J B,et al.Hole injection layer effect on red oled performance[J].Acta Photon.Sinica(光子学报),2013,42(1):24-27(in Chinese).
[4]Lu D,Guo J H.Efficient blue electroluminescent devices based on hydroxyphenyl pyidine beryllium complex[J].Chin.J.Lumin.(发光学报),2005,26(2):237-241(in Chinese).
[5]Seo J A,Gong M,Lee J Y.High external quantum efficiency in yellow and white phosphorescent organic light-emitting diodes using an indoloacridinefluorene type host material[J].Org.Electron.,2014,15(8):1843-1848.
[6]Zhang Z Q,Wang Q,Dai Y F,et al.High efficiency fluorescent white organic light-emitting diodes with red,green and blue separately monochromatic emission layers[J].Org.Electron.,2009,10(3):491-495.
[7]Zhang W,Zhang F H,Huang J.Properties of phosphorescent organic light-emitting diodes with different doping order on light emitting layer[J].Spectrosc.Spect.Anal.(光谱学与光谱分析),2013,33(7):1763-1766(in Chinese).
[8]Li Y T,Chen H,Chu M H,et al.Organic light-emitting devices with a coupled microcavity[J].Chin.J.Lumin.(发光学报),2011,32(11):1186-1191(in Chinese).
[9]Huang J,Zhang F H,Zhang W.Regulation of carrier in double organic electroluminescent phosphorescent emitting layer(green and red)[J].Chin.J.Liq.Cryst.Disp.(液晶与显示),2014,29(1):22-27(in Chinese).
[10]Xie Z Y,Li Y Q,Huang J S,et al.Organic multiple-quantum well white electroluminescent devices[J].Synth.Met.,1999,106(1):71-74.
[11]Zhao B,Su Z S,Li W L,et al.High efficient white organic light-emitting diodes based on triplet multiple quantum well structure[J].Appl.Phys.Lett.,2012,101(5):053310-1-4.
[12]Zhao F C,Chen Y H,Wang Q,et al.Studies of fluorescenc/phosphorescence hybrid white organic light-emitting diodes[J].Sci.China Chem.(中国科学:化学),2013,43(4):398-406(in Chinese).
[13]Li Q,Zhao J,Wang Q,et al.Effect of spacer on white organic light-emitting devices consisted of double light-emitting layers[J].Chin.J.Lumin.(发光学报),2012,33(1):45-50(in Chinese).
[14]Sang B S,Su C G,Lee H M,et al.Improving light efficiency of white polymer light emitting diodes by introducing the TPBi exciton protection layer[J].Thin Solid Films,2009,517(14):4143-4146.
[15]Park Y S,Lee S H,Kim K H,et al.Exciplex-forming co-host for organic light-emitting diodes with ultimate efficiency[J].Adv.Funt.Mater.,2013,23(39):4914-4920.
[16]Zhang W,Zhang F H,Huang J.Effect of spacer on red and green phosphorescent organic light-emitting devices[J].Spectrosc.Spect.Anal.(光谱学与光谱分析),2014,34(2):322-326(in Chinese).
[17]Zhang M L,Zhang F H,Zhang W,et al.Luminance performances of phosphorescent organic light-emitting diodes based on different Ir(ppy)2acac doping[J].Chin.J.Liq.Cryst.Disp.(液晶与显示),2014,29(3):328-332(in Chinese).