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Citation: ZHANG Chenyang, LUO Kaijun, ZHOU Shijie, JIA Juan, SU Yiwei, SU Shijian. Synthesis and Luminescent Properties of Bis(2',6'-difluoro-2,3'-bipyridinato-N,C4') Iridium(Ⅲ)(2,4-pentanedione-O,O)[J]. Chinese Journal of Applied Chemistry, ;2014, 31(6): 690-695. doi: 10.3724/SP.J.1095.2014.30382 shu

Synthesis and Luminescent Properties of Bis(2',6'-difluoro-2,3'-bipyridinato-N,C4') Iridium(Ⅲ)(2,4-pentanedione-O,O)

ZHANG Chenyang ^a ,
LUO Kaijun ^a,, ,
ZHOU Shijie ^b ,
JIA Juan ^c ,
SU Yiwei ^a ,
SU Shijian ^b,,

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

Corresponding author: LUO Kaijun, SU Shijian,
Received Date: 30 July 2013
Available Online: 28 October 2013
Fund Project: 国家自然科学基金(21072141,21172161,51073057,91233116)资助项目 (21072141,21172161,51073057,91233116)

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(λ_max) 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)2 Ir(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).
- iridium complex,
- difluoro-bipyridine,
- blue phosphorescence,
- polymer light emitting diode,
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