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0.23×10-3 A/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).
参考文献
| [1] | Baldo M A,Brien D F,You Y,et al.Highly Effcient Phosphorescent Emission from Organic Electroluminescent Devices[J].Nature,1998,395:151-154. |
| [2] | Brooks J,Babayan Y,Lamansky S,et al.Synthesis and Characterization of Phosphorescent Cyclometalated Platinum Complexes[J].Inorg Chem,2002,41:3055-3066. |
| [3] | Lamansky S,Djurovich P,Murphy D,et al.Synthesis and Characterization of Phosphorescent Cyclometalated Iridium Complexes[J].Inorg Chem,2001,40:1704-1711. |
| [4] | Ulbricht C,Beyer B,Friebe C,et al.Recent Developments in the Application of Phosphorescent Iridium (Ⅲ) Complexes[J].Adv Mater,2009,21:4418-4441. |
| [5] | Chou P T,Chi Y.Phosphorescent Dyes for Organic Light-Emitting Diodes[J].Chem Eur J,2007,13:380-395. |
| [6] | Xiao L X,Chen Z J,Qu B,et al.Recent Progresses on Materials for Electrophosphorescent Organic Light-Emitting Decies[J].Adv Mater,2011,23:926-952. |
| [7] | Tanaka D,Sesabe H,Li Y J,et al.Ultra High Efficiency Green Organic Light-Emitting Devices[J].Jpn J Appl Phys,2007,46:L10-L12. |
| [8] | Sasabe H,Chiba T,Su S J,et al.2-Phenylpyrimidine Skeleton-Based Electron-Transport Materials for Extremely Efficient Green Organic Light-Emitting Devices[J].Chem Commun,2008:5821-5823. |
| [9] | Su S J,Tanaka D,Li Y J,et al.Novel Fore-Pyridylbenzene-Armed Biphenyls as Electron-Transport Materials for Phosphorescent OLEDs[J].Org Lett,2008,10:941-944. |
| [10] | Su S J,Chiba T,Tkeda T,et al.Pyridine-Containing Tripheylbenzene Derivatives with High Electron Mobility for Highly Efficient phosphorescent OLEDs[J].Adv Mater,2008,20:2125-2130. |
| [11] | Sasabe H,Gonmori E,Chiba T,et al.Wide-Energy-Gap Electron-Transport Materials Containing 3,5-Dipyridylphengl Moieties for an Ultra High Efficiency Blue Organic Light-Emitting Device[J].Chem Mater,2008,20:5951-5953. |
| [12] | Su S J,Goumori E,Sesabe H,et al.Highly Efficient Organic Blue-and White-Light-Emitting Devices Having a Carrier-and Exciton-Confining Structure for Reduced Efficiency Roll-Off[J].Adv Mater,2008,20:4189-4194. |
| [13] | Xiao L X,Su S J,Agata Y,et al.Nearly 100％ Internal Quantum Efficiency in an Organic Blue-Light Eletrophosphorescent Device Using a Weak electron Transporting Material with a Wide Energy Gap[J].Adv Mater,2009,21:1271-1274. |
| [14] | Holmes R J,Forrest S R,Tung Y J,et al.Blue Organic Eletrophosphorescence Using Exothermic Host-Guest Energy Transfer[J].Appl Phys Lett,2003,82:2422-2424. |
| [15] | Yeh S J,Wu M F,Chen C T,et al.New Dopant and Host Materials for Blue-Light-Emitting Phosphorescent Organic Electroluminescent Devices[J].Adv Mater,2005,17:285-289. |
| [16] | Zheng Y,Eom S H,Chopra N,et al.Efficient Deep-Blue Phosphorescent Organic Light-Emitting Device with Improved Electron and Exciton confinement[J].Appl Phys Lett,2008,92:223301-223303. |
| [17] | Chiu Y C,Hung J Y,Chi Y,et al.An Route to High External Quantum Efficiency(～ 12％),Organic True-Blue-Light-Emitting Diodes Employing Novel Design of Iridium (Ⅲ) Phosphors[J].Adv Mater,2009,21:2221-2225. |
| [18] | Chang C F,Cheng Y M,Chi Y,et al.Highly Efficient Blue-Emitting Iridium(Ⅲ) Carbene Complexes and Phosphorescent OLEDs[J].Chem Int Ed,2008,47:4542-4545. |
| [19] | Lee S J,Park K M,Yang K,et al.Blue Phosphorescent Ir(Ⅲ) Complex with High Color Purity:fac-Tris(2',6'-difluoro-2,3'-bipyridinato-N,C4')iridium(Ⅲ)[J].Inorg Chem,2009,48:1030-1037 |
| [20] | Kang Y J,Chang Y L,Lu J S,et al.Highly Efficient Blue Phosphorescent and Electroluminescent Ir(Ⅲ) Compounds[J].J Mater Chem C,2013,1:441-450. |
| [21] | Lamansky S,Djurovich P,Murphy D,et al.Highly Phosphorescent Bis-Cyclometalated Iridium Complexes:Synthesis,Photophysical Characterization,and Use in Organic Light Emiuing Diodes[J].J Am Chem Soc,2001,123:4304-4312. |
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