Synthesis and Luminescent Properties of Bis(2′,6′-difluoro-2,3′-bipyridinato-N,C-4′) Iridium(Ⅲ)(2,4-pentanedione-O,O)

doi:10.3724/SP.J.1095.2014.30382

Chinese Journal of Applied Chemistry

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Synthesis and Luminescent Properties of Bis(2′,6′-difluoro-2,3′-bipyridinato-N,C-4′) Iridium(Ⅲ)(2,4-pentanedione-O,O)

ZHANG Chenyang¹, LUO Kaijun^1*, ZHOU Shijie², JIA Juan³, SU Yiwei¹, SU Shijian^2*

(1.College of Chemistry and Materials Science,Sichuan Normal University,Chengdu 610068,China;
2.School of Materials Science and Engineering,South China University of Technology,Guangzhou 510640,China;
3.Department of Chemistry and Engineering,Ankang University,Ankang 725000,China)

Received:2013-07-30 Revised:2013-10-27 Published:2014-06-10 Online:2014-06-10

Abstract

Abstract: A blue phosphorescent iridium(Ⅲ) complex incorporating 2′,6′-difluoro-2,3′-bipyridine and acetyl acetonate, (dfpypy)2Ir(acac), was synthesized. At room temperature, (dfpypy)2Ir(acac) in tetrahydrofuran was intensely phosphorescent with the maximum emission wavelength(λmax) at 465 nm accompanied a shoulder peak at 490 nm. The full-width at half maximum(fwhm) was 53 nm. The emission bands at 465 and 490 nm were red-shifted, compared with the emission spectra of fac-Ir(dfpypy)3 which has two emission peaks at 438 and 463 nm with nearly equal intensities. The photoluminescence(PL) quantum yield in degassed tetrahydrofuran solution at room temperature was determined to be 0.41. The blue phosphorescent electroluminescence devices were fabricated by doping (dfpypy)2Ir(acac) into the PVK host. The device has the following configuration:ITO/PEDOT/PVK∶(dfpypy)2Ir(acac)(100∶x)(70 nm)/Ba/Al, ITO∶indium tin oxide, PEDOT∶poly(3,4-ethylenedioxythiophene), PSS∶poly(styrene sulfonic acid), PVK∶poly(vinylcarbazole), x∶doping contents. The doping concentration of (dfpypy)2Ir(acac) varied from 2% to 12%. The sky blue emission was observed for all doping concentrations. When the host in devices was doped with 2% of (dfpypy)2Ir(acac), the maximum luminance efficiency of 1.6 cd/A at a current density of 0.23×10-3 A/cm2 was achieved and the maximum brightness of 1400 cd/m2 at driven voltage of 15.4 V with 1931 Commission Internationale L′Eclairage(CIE) coordinates of (0.15,0.27).

Key words: iridium complex, difluoro-bipyridine, blue phosphorescence, polymer light emitting diode

CLC Number:

O626.3

ZHANG Chenyang1, LUO Kaijun1*, ZHOU Shijie2, JIA Juan3, SU Yiwei1, SU Shijian2*. Synthesis and Luminescent Properties of Bis(2′,6′-difluoro-2,3′-bipyridinato-N,C-4′) Iridium(Ⅲ)(2,4-pentanedione-O,O)[J]. Chinese Journal of Applied Chemistry, DOI: 10.3724/SP.J.1095.2014.30382.

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Synthesis and Luminescent Properties of Bis(2′,6′-difluoro-2,3′-bipyridinato-N,C-4′) Iridium(Ⅲ)(2,4-pentanedione-O,O)

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