A Multifunctional Platinum-Based Triplet Emitter for OLED Applications

Wong, Wai Yeung; He, Ze; So, Shu Kong; Tong, K. L.; Lin, Zhenyang

doi:10.1021/om050343b

Cited by 190 publications

(80 citation statements)

References 36 publications

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“…[15,16,19,32,33,41,43,[47][48][49][50][51][52][53] The mono-, di-and trinuclear (RC^N^N) complexes of platinum(II) reported in this work are strongly emissive and have high emission quantum yields in solutions at room temperature. The emission quantum yield of 1 d (0.68 in CH 2 Cl 2 ) is significantly higher than that of [(C^N^N)PtCl] [13] and [PtA C H T U N G T R E N N U N G (tBu 2 N 2 O 2 )], [32] with the latter two showing emission at 565 (F = 0.025) and 595 nm (F = 0.12), respectively, in CH 2 Cl 2 solutions ( Table 8 II complexes: 1) the extended p-conjugation would increase the electronic delocalization, hence a smaller bond displacement change in the excited state compared to those for (C^N^N) analogues is expected.…”

Section: Discussionmentioning

confidence: 99%

Platinum(II) Complexes with π‐Conjugated, Naphthyl‐Substituted, Cyclometalated Ligands (RC^N^N): Structures and Photo‐ and Electroluminescence

Kui

Sham

Cheung

et al. 2006

Chemistry A European J

164

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The crystal structures and photophysical properties of mononuclear [(RC N N)PtX](ClO4)n ((RC N N)=3-(6'-(2''-naphthyl)-2'-pyridyl)isoquinolinyl and derivatives; X=Cl, n=0; X=PPh(3) or PCy(3), n=1), dinuclear [(RC N N)2Pt2(mu-dppm)](ClO4)2 (dppm=bis(diphenyphosphino)methyl) and trinuclear [(RC N N)3Pt3(mu-dpmp)](ClO4)3 (dpmp=bis(diphenylphosphinomethyl)phenylphosphine) complexes are presented. The crystal structures show extensive intra- and/or intermolecular pipi interactions; the two (RC N N) planes of [(RC N N)2Pt2(mu-dppm)](ClO4)2 (R=Ph, 3,5-tBu2Ph or 3,5-(CF3)2Ph) are in a nearly eclipsed configuration with torsion angles close to 0 degrees. [(RC N N)PtCl], [(RC N N)2Pt2(mu-dppm)](ClO4)2, and [(RC N N)3Pt3(mu-dpmp)](ClO4)3 are strongly emissive with quantum yields of up to 0.68 in CH2Cl2 or MeCN solution at room temperature. The [(RC N N)PtCl] complexes have a high thermal stability (T(d)=470-549 degrees C). High-performance light-emitting devices containing [(RC N N)PtCl] (R=H or 3,5-tBu2Ph) as a light-emitting material have been fabricated; they have a maximum luminance of 63,000 cd m(-2) and CIE 1931 coordinates at x=0.36, y=0.54.

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Section: Discussionmentioning

confidence: 99%

Platinum(II) Complexes with π‐Conjugated, Naphthyl‐Substituted, Cyclometalated Ligands (RC^N^N): Structures and Photo‐ and Electroluminescence

Kui

Sham

Cheung

et al. 2006

Chemistry A European J

164

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“…Furthermore, we chose units that may be easily derivatized, thereby giving great flexibility to this design strategy. Wong et al [8] and Gong et al [9] have synthesized integrated molecules containing all three functionalities and shown that they are effective as a single chargetransport and emitting layer in OLEDs. Trifunctional polymers have also been prepared.…”

Section: Dedicated To Professor John J Mcgarveymentioning

confidence: 99%

Synthesis and Characterization of a Multicomponent Rhenium(I) Complex for Application as an OLED Dopant

et al. 2006

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“…[8,10,19] Platinum(II) complexes have been used as phosphorescent emitters in small-molecule OLEDs. [4,12,[20][21][22][23][24][25] Since the first phosphorescent OLED was reported with 2, 3,7,8,12,13,17,18-octaethyl-21H,23H-porphine platinum(II) (PtOEP) as a red emissive dopant, [4] platinum(II) complexes have been used to prepare OLEDs that give green, red, and even white EL with external quantum efficiencies as high as 16.5 %. [15] However, to date no blue OLEDs with high efficiency using platinum-complex emitters have been reported, which may be due to the fact that luminescence from platinum(II) complexes show significant spectral shifts upon dopant aggregation, leading to broad, red-shifted emission.…”

Section: Introductionmentioning

confidence: 99%

Platinum Binuclear Complexes as Phosphorescent Dopants for Monochromatic and White Organic Light‐Emitting Diodes

Djurovich

Garon

et al. 2006

Adv Funct Materials

218

168

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Efficient blue‐, green‐, and red‐light‐emitting organic diodes are fabricated using binuclear platinum complexes as phosphorescent dopants. The series of complexes used here have pyrazolate bridging ligands and the general formula C∧NPt(μ‐pz)2PtC∧N (where C∧N = 2‐(4′,6′‐difluorophenyl)pyridinato‐N,C2′, pz = pyrazole (1), 3‐methyl‐5‐tert‐butylpyrazole (2), and 3,5‐bis(tert‐butyl)pyrazole (3)). The Pt–Pt distance in the complexes, which decreases in the order 1 > 2 > 3, solely determines the electroluminescence color of the organic light‐emitting diodes (OLEDs). Blue OLEDs fabricated using 8 % 1 doped into a 3,5‐bis(N‐carbazolyl)benzene (mCP) host have a quantum efficiency of 4.3 % at 120 Cd m–2, a brightness of 3900 Cd m–2 at 12 V, and Commission Internationale de L'Eclairage (CIE) coordinates of (0.11, 0.24). Green and red OLEDs fabricated with 2 and 3, respectively, also give high quantum efficiencies (∼ 6.7 %), with CIE coordinates of (0.31, 0.63) and (0.59, 0.46), respectively. The current‐density–voltage characteristics of devices made using dopants 2 and 3 indicate that hole trapping is enhanced by short Pt–Pt distances (< 3.1 Å). Blue electrophosphorescence is achieved by taking advantage of the binuclear molecular geometry in order to suppress dopant intermolecular interactions. No evidence of low‐energy emission from aggregate states is observed in OLEDs made with 50 % 1 doped into mCP. OLEDs made using 100 % 1 as an emissive layer display red luminescence, which is believed to originate from distorted complexes with compressed Pt–Pt separations located in defect sites within the neat film. White OLEDs are fabricated using 1 and 3 in three different device architectures, either with one or two dopants in dual emissive layers or both dopants in a single emissive layer. All the white OLEDs have high quantum efficiency (∼ 5 %) and brightness (∼ 600 Cd m–2 at 10 V).

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A Multifunctional Platinum-Based Triplet Emitter for OLED Applications

Cited by 190 publications

References 36 publications

Platinum(II) Complexes with π‐Conjugated, Naphthyl‐Substituted, Cyclometalated Ligands (RC^N^N): Structures and Photo‐ and Electroluminescence

Platinum(II) Complexes with π‐Conjugated, Naphthyl‐Substituted, Cyclometalated Ligands (RC^N^N): Structures and Photo‐ and Electroluminescence

Synthesis and Characterization of a Multicomponent Rhenium(I) Complex for Application as an OLED Dopant

Platinum Binuclear Complexes as Phosphorescent Dopants for Monochromatic and White Organic Light‐Emitting Diodes

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