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中文摘要：
使用星形六苯芴类新材料1,2,3,4,5,6-hexakis（9,9-diethyl-9H-fluoren-2-yl）benzene（HKEthFLYPh）分别制备了三种不同结构的有机电致发光器件.在结构为indium-tin oxide（ITO）/NPB（40nm）/HKEthFLYPh（10nm）/Alq3（50nm）/Mg：Ag（200nm）的器件中,获得了两个电致发光谱峰分别位于435和530nm处的明亮白光.HKEth-FLYPh是能量传输层;N,N′-bis-（1-naphthyl）-N,N′-diphenyl-（1,1′-biphenyl）-4,4′-diamine（NPB）是空穴传输层和蓝色发光层;tris（8-hydroxyquinoline）aluminum（Alq3）是电子传输层和绿色发光层.结果表明,当驱动电压为15V时,器件的最大亮度达到8523cd·m^-2;在5.5V时,器件达到最大流明效率为1.0lm·W^-1.在电压为9V时,CIE色坐标为（0.29,0.34）.此外,通过改变HKEthFLYPh层的厚度,发现蓝色发射的相对强度随着HKEthFLYPh层厚度的增加而增强.
英文摘要：
Double-layer and triple-layer organic light-emitting diodes （OLEDs） were fabricated using a novel starshaped hexafluorenylbenzene organic material, 1,2,3,4,5,6-hexakis（9,9-diethyl-9H-fluoren-2-yl）benzene （HKEthFLYPh） as an energy transfer layer, N,N＇-bis-（1-naphthyl）-N,N＇-diphenyl-（1,1 ＇-biphenyl）-4,4＇-diamine （NPB） as a hole-transport layer （HTL） and blue emissive layer （EML）, and tris （8-hydroxyquinoline）aluminum （Alq3） as an electron-transport layer （ETL） and green light-emitting layer. Bright white light was obtained with a triple-layer device structure of indiumtin-oxide （ITO）/NPB （40 nm）/HKEthFLYPh （10 nm）/Alq3 （50 nm）/Mg：Ag （200 nm）. A maximum luminance of 8523 cd-m-2 at 15 V and a power efficiency of 1.0 lm·W^-1 at 5.5 V were achieved. The Commissions Internationale de L＇ Eclairage （CIE） coordinates of the device were （0.29, 0.34） at 9 V, which located in white light region. With increasing film thickness of HKEthFLYPh, light emission intensity from NPB increased compared to that of Alq3.
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