ICCAS OpenIR
A multifunctional iridium-carbazolyl orange phosphor for high-performance two-element WOLED exploiting Exciton-Managed fluorescence/phosphorescence
Ho, Cheuk-Lam1,2; Wong, Wai-Yeung1,2; Wang, Qi3; Ma, Dongge3; Wang, Lixiang3; Lin, Zhenyang
2008-03-25
Source PublicationADVANCED FUNCTIONAL MATERIALS
ISSN1616-301X
Volume18Issue:6Pages:928-937
AbstractBy attaching a bulky, inductively electron-with drawing trifluoromethyl (CF(3)) group on the pyridyl ring of the rigid 2-[3(N-phenylcarbazolyl)]pyridine cyclometalated ligand, we successfully synthesized a new heteroleptic orange-emitting phosphorescent iridium(III) complex [Ir(L(1))(2)(acac)] 1 (HL(1)=5-trifluoromethyl-2-[3-(N-phenylcarbazolyl)]pyridine, Hacac = acetylacetone) in good yield. The structural and electronic properties of 1 were examined by X-ray crystallography and time-dependent DFT calculations. The influence of CF3 substituents on the optical, electrochemical and electroluminescence (EL) properties of I were studied. We note that incorporation of the carbazolyl unit facilitates the hole-transporting ability of the complex, and more importantly, attachment of CF3 group provides an access to a highly efficient electrophosphor for the fabrication of orange phosphorescent organic light-emitting diodes (OLEDs) with outstanding device performance. These orange OLEDs can produce a maximum current efficiency of similar to 40 cd A(-1), corresponding to an external quantum efficiency of similar to 12% ph/el (photons per electron) and a power efficiency of similar to 24 lm W(-1). Remarkably, high-performance simple two-element white OLEDs (WOLEDs) with excellent color stability can be fabricated using an orange triplet-harvesting emitter I in conjunction with a blue singlet-harvesting emitter. By using such a new system where the host singlet is resonant with the blue fluorophore singlet state and the host triplet is resonant with the orange phosphor triplet level, this white light-emitting structure can achieve peak EL efficiencies of 26.6 cd A(-1) and 13.5 lm W(-1) that are generally superior to other two-element all-fluorophore or all-phosphor OLED counterparts in terms of both color stability and emission efficiency.
DOI10.1002/adfm.200701115
Indexed BySCI
Language英语
WOS IDWOS:000254872100011
PublisherWILEY-BLACKWELL
Citation statistics
Cited Times:233[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/64696
Collection中国科学院化学研究所
Corresponding AuthorHo, Cheuk-Lam
Affiliation1.Hong Kong Baptist Univ, Dept Chem, Kowloon Tong, Hong Kong, Peoples R China
2.Hong Kong Baptist Univ, Ctr Adv Luminescence Mat, Kowloon Tong, Hong Kong, Peoples R China
3.Chinese Acad Sci, Inst Appl Chem, State Key Lab Polymer Phys & Chem, Changchun 130022, Peoples R China
Recommended Citation
GB/T 7714
Ho, Cheuk-Lam,Wong, Wai-Yeung,Wang, Qi,et al. A multifunctional iridium-carbazolyl orange phosphor for high-performance two-element WOLED exploiting Exciton-Managed fluorescence/phosphorescence[J]. ADVANCED FUNCTIONAL MATERIALS,2008,18(6):928-937.
APA Ho, Cheuk-Lam,Wong, Wai-Yeung,Wang, Qi,Ma, Dongge,Wang, Lixiang,&Lin, Zhenyang.(2008).A multifunctional iridium-carbazolyl orange phosphor for high-performance two-element WOLED exploiting Exciton-Managed fluorescence/phosphorescence.ADVANCED FUNCTIONAL MATERIALS,18(6),928-937.
MLA Ho, Cheuk-Lam,et al."A multifunctional iridium-carbazolyl orange phosphor for high-performance two-element WOLED exploiting Exciton-Managed fluorescence/phosphorescence".ADVANCED FUNCTIONAL MATERIALS 18.6(2008):928-937.
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