中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
Bipolar Heteroleptic Green Iridium Dendrimers Containing Oligocarbazole and Oxadiazole Dendrons for Bright and Efficient Nondoped Electrophosphorescent Devices

文献类型:期刊论文

作者Chen LC ; Ding JQ ; Cheng YX ; Xie ZY ; Wang LX ; Jing XB ; Wang FS
刊名chemistry-an asian journal
出版日期2011
卷号6期号:6页码:1372-1380
关键词LIGHT-EMITTING DEVICES ORGANIC ELECTROLUMINESCENT DEVICES COMPLEXES DIODES HOST CHROMOPHORES TRANSPORT PHOSPHORESCENCE MOLECULES EMISSION
ISSN号1861-4728
通讯作者ding jq
中文摘要bipolar heteroleptic green light-emitting iridium (ir) dendrimers g(oxd) and g(doxd) have been designed and synthesized under mild conditions in high yields, in which the first c boolean and n and second o boolean and o ligands are functionalized with oligocarbazole- and oxadiazole-based dendrons, respectively. to avoid affecting the optical properties of the emissive iridium core, all the functional moieties are attached to the ligands through a flexible spacer. compared with the unipolar dendrimer g(acac), dendrimers g(oxd) and g(doxd) exhibit the close emission maxima of 511-512 nm and photoluminescence quantum yield of 0.39-0.40 in a solution of toluene. moreover, on going from g(acac) to g(oxd) and g(doxd), we have found that the introduction of oxadiazole fragments decreases the lowest unoccupied molecular orbital (lumo) energy levels to facilitate the electron injection and electron transporting, while their highest occupied molecular orbital (homo) energy levels remain unchanged. this means that, we can individually tune the homo and lumo energy levels based on the heteroleptic structure to ensure the relative independence between the hole and electron in the emitting layer (eml), which is a favorable feature for bipolar optoelectronic materials. as a result, a bilayer nondoped electrophosphorescent device with g(doxd) as the eml gives a maximum luminous efficiency of 25.5 cd a(-1) (eta(ext): 7.4%) and a brightness of 33 880 cd m(-2). in comparison to g(acac) (17.2 cd a(-1), 17 680 cd m(-2)), both the efficiency and brightness are improved by about 1.5 and 2 times, respectively. these state-of-the-art performances indicate the potential of these bipolar heteroleptic iridium dendrimers as solution-processible emitting materials for nondoped device applications.
收录类别SCI收录期刊论文
语种英语
WOS记录号WOS:000292097700014
公开日期2012-06-11
源URL[http://ir.ciac.jl.cn/handle/322003/44588]  
专题长春应用化学研究所_长春应用化学研究所知识产出_期刊论文
推荐引用方式
GB/T 7714
Chen LC,Ding JQ,Cheng YX,et al. Bipolar Heteroleptic Green Iridium Dendrimers Containing Oligocarbazole and Oxadiazole Dendrons for Bright and Efficient Nondoped Electrophosphorescent Devices[J]. chemistry-an asian journal,2011,6(6):1372-1380.
APA Chen LC.,Ding JQ.,Cheng YX.,Xie ZY.,Wang LX.,...&Wang FS.(2011).Bipolar Heteroleptic Green Iridium Dendrimers Containing Oligocarbazole and Oxadiazole Dendrons for Bright and Efficient Nondoped Electrophosphorescent Devices.chemistry-an asian journal,6(6),1372-1380.
MLA Chen LC,et al."Bipolar Heteroleptic Green Iridium Dendrimers Containing Oligocarbazole and Oxadiazole Dendrons for Bright and Efficient Nondoped Electrophosphorescent Devices".chemistry-an asian journal 6.6(2011):1372-1380.

入库方式: OAI收割

来源:长春应用化学研究所

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