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1. 石家庄诚志永华显示材料有限公司北京研发中心 北京,100084
2. 河北省平板显示材料工程技术研究中心,河北 石家庄,050091
3. 清华大学 化学系 北京,100084
Received:20 January 2015,
Revised:06 February 2015,
Published:05 October 2015
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逄辉, 郑成武, 曹建华, 张兴, 华瑞茂. 一种含液晶基元的新型铱配合物的合成与发光性能研究[J]. 液晶与显示, 2015,30(5): 752-756
PANG Hui, ZHENG Cheng-wu, CAO Jian-hua, ZHANG Xing, HUA Rui-mao. Synthesis and electrophosphorescence of a novel Iridium(III) complex containing liquid-crystal fragment[J]. , 2015,30(5): 752-756
逄辉, 郑成武, 曹建华, 张兴, 华瑞茂. 一种含液晶基元的新型铱配合物的合成与发光性能研究[J]. 液晶与显示, 2015,30(5): 752-756 DOI: 10.3788/YJYXS20153005.0752.
PANG Hui, ZHENG Cheng-wu, CAO Jian-hua, ZHANG Xing, HUA Rui-mao. Synthesis and electrophosphorescence of a novel Iridium(III) complex containing liquid-crystal fragment[J]. , 2015,30(5): 752-756 DOI: 10.3788/YJYXS20153005.0752.
为了实现溶液化制备有机电致发光器件(OLED)
制备和应用具有高溶解性的有机电致发光材料是重要的手段之一。本工作设计和合成了一种含液晶分子中常用的丙基双环己基二氟苯基结构单元的配体及其铱配合物Ir(cfpp)
2
(acac) (cfpp=2-(2
3-二氟-5-[trans
trans-4'-丙基-(1
1'-双环己基)]苯基)吡啶); acac=乙酰丙酮负离子)。以其作为绿色发光掺杂材料
按照2%、4%和8%的掺杂含量旋涂制备了OLED器件
器件结构为ITO/PEDOT:PSS/PVK:PBD:Ir(cfpp)
2
(acac)/TPBi/LiF/Al。当掺杂浓度为8%时
器件的最大发射波长为524 nm
最大发光亮度达到3600 cd/m
2
;当电流密度为20 mA/cm
2
时
最大电流效率和功率效率分别为2.0 cd/A和0.6 lm/W
具有较强的电致发光特性。研究结果表明
应用含液晶结构单元设计和合成高溶解性的有机电致发光材料是可行的研究思路
为制备可旋涂有机电致发光材料提供了新方法。
In order to realize the fabrication of the OLEDs by solution-processing
synthesis and application of highly soluble organic electroluminescent materials is one of the important ways. In the present work
a ligand containing a structural moiety of 4'-n-propyl-(1
1'-bicyclohexyl)-4-difluorophenyl commonly used in liquid crystal molecules and its iridium complex
Ir(cfpp)
2
(acac) (cfpp=2-[2
3-difluoro-5-(trans
trans-4"-n-propyl-(1"
1'-bicyclohexyl)-4'-yl)phenylpyridine); acac=acetylacetonate) were synthesized. The synthesized iridium complex was used as a green light-emitting dopant material with 2%
4% and 8% doping concentration (mass fraction) in emissive layer to fabricate OLED devices by spin-coating method
and the structure of OLED device comprises of ITO/PEDOT:PSS/PVK:PBD:Ir(cfpp)
2
(acac)/TPBi/LiF/Al. When the doping concentration was 8%
the maximum emission wavelength of OLED device appears at 524 nm with the maximum brightness of 3500 cd/m
2
. When the current density is 20 mA/cm
2
the maximum current efficiency and power efficiency of the device are 2.0 cd/A and 0.6 lm/W
respectively
indicating that the prepared device shows the interesting characteristics of electroluminescence. The obtained results imply that it is a practical concept to design and synthesize the soluble organic electroluminescent materials for spin-coating procedure by introduction of the structural moiety of liquid crystal molecules.
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