二-[2＇,6＇-二氟-2,3＇-联吡啶-N,C4＇][2,4-戊二酮-O,O]铱(Ⅲ)的合成及其发光性能

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

以2',6'-二氟-2,3'-联吡啶(Hdfpypy)为主配体,乙酰丙酮为辅助配体,合成了二-[2',6'-二氟-2,3'-联吡啶-N,C4'][2,4-戊二酮-O,O]铱(Ⅲ)配合物((dfpypy)2Ir(acac))。在THF溶液中,该配合物溶液最大光致发光光谱为465 nm(半峰宽为53 nm),同时伴有490 nm的肩峰,与面式-Ir(dfpypy)3在438和463 nm两个强度相近的发光光谱相比,发生了红移。配合物在脱气四氢呋喃溶液中的PL量子效率为0.41。将(dfpypy)2Ir(acac)以不同的浓度掺杂在主体材料聚乙烯基咔唑(PVK)中,制备了器件结构为:ITO/PEDOT∶PSS(聚二氧乙基噻吩∶聚对苯乙烯磺酸)/PVK∶(dfpypy)2Ir(acac)(100∶x)(70 nm)/Ba/Al的蓝色聚合物发光器件(x代表掺杂量)。在驱动电压为15.4 V时,2%掺杂器件的最大发光亮度为1400 cd/m2。当电流密度为0.23×10-3A/cm2时,2%掺杂器件最大亮度效率(ηc)为1.6 cd/A。器件的色坐标(CIE)值为(0.15,0.27)。

A blue phosphorescent iridium （Ⅲ） complex incorporating 2＇,6＇-difluoro-2,3＇-bipyridine and acetyl acetonate,（dfpypy）2 Ir （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 um 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） 2 Ir （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） 2 Ir （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/cm^2 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）.