共查询到15条相似文献,搜索用时 187 毫秒
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以3-甲基-1-(2-氟苯基)咪唑和3-甲基-1-(4-氟苯基)咪唑作为第一配体,2-甲酸吡啶作为第二配体,合成了以铱(III)为内核的两种有机电致磷光材料(o-fpmi)2Ir(pic)(o-fpmi=3-甲基-1-(2-氟苯基)咪唑,pic=2-甲酸吡啶)和(fpmi)2Ir(pic)(fpmi=3-甲基-1-(4-氟苯基)咪唑)。通过核磁1H NMR和液相质谱LC-MS对其结构进行分析确认,并用紫外-可见吸收光谱、荧光发射光谱和循环伏安法测定其光电物理性能,热重分析测定铱配合物的热稳定性。结果表明,(fpmi)2Ir(pic)和(o-fpmi)2Ir(pic)的紫外吸收峰值为231,270,300,360 nm和237,281,315,370 nm,最大荧光发射波长为502 nm和508 nm,主要来源于三重态3MLCT的辐射跃迁,热分解温度为300℃,是一类热稳定性好的蓝绿色发光材料。 相似文献
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通过在2,4-二氯吡啶上引入3-联苯基,合成了一种以2,4-二(3-联苯)吡啶为主配体,以2,2,6,6-四甲基-3,5-庚二酮为辅助配体的新型有机电致磷光材料,通过元素分析、红外光谱、~1H NMR和质谱对产物进行了结构表征,利用X射线单晶衍射仪测定了配合物的晶体结构。并对其用紫外-可见吸收、光致发光、热稳定性等进行研究。研究表明,配合物在395和465nm处存在单重态~1MLCT(金属到配体的电荷跃迁)和三重态~3MLCT的吸收峰;其初始分解温度为405℃(对应于10%质量损失),最大发射波长为570nm,是一种可用于白色有机电致发光器件的新型黄色发光磷光材料。 相似文献
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采用密度泛函方法对两种Ir(ppy)2(O^N)(ppy=2-苯基吡啶;O^N=2-(2-羟基苯)-苯并噻唑(1),O^N=2-(2-羟基苯)-苯并恶唑(2))配合物的几何结构和光谱特征进行了详细的理论研究。计算得到的Ir-N(1)、Ir-N(3)和Ir-O(1)基态键长和相应实验值符合得较好。激发态下,Ir-N(1)和Ir-C(1)键长均增加了约0.02~0.05,而Ir-O(1)键长则缩短了大约0.02。在TD-DFT计算水平下结合极化连续介质(PCM)模型,得到1~2的最低能吸收和发射分别出现在484 nm(1)、441 nm(2)和624 nm(1)、519 nm(2)。1和2的此跃迁均属于[d(Ir)+π(ppy)+π(O^N)→π*(O^N)]的电荷转移跃迁。计算结果表明,ppy和O^N配体在跃迁过程中担当两个独立的发色团。与分子2相比,由于1在O^N配体上存在噻唑环,导致其分子整体结构变化较大,并使吸收和发射波长产生明显红移。 相似文献
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对具有代表性的绿色磷光发光掺杂材料Ir(ppy)3[三(2-苯基吡啶)合铱]进行了改性,在其配位体处导入了含有较大空间位阻的芳香族置换基团;设计开发了具有空穴/电子传导部位的EL(有机电致发光)共聚物,并分别对改性后的磷光掺杂材料[如Ir(Bu-ppy)3(三丁基吡啶合铱配合物)、Ir(Cz-ppy)3(三咔唑吡啶合铱配合物)等]与导电高分子掺杂后制成的OLED(有机发光二极管)的性能进行了分析。研究结果表明:上述芳香族置换基团能减轻浓度消光效应,提高原有掺杂材料的发光效率,并且提高了含该掺杂体的高分子材料在有机溶剂中的溶解性;含Bu-ppy配位结构的磷光掺杂材料比含Cz-ppy配位结构的掺杂材料具有更高的器件效率。 相似文献
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Hui-Jun Yun Kwon-Hyeon Kim So-hee Kang Jang-Joo Kim Yun-Hi Kim 《Israel journal of chemistry》2014,54(7):993-998
The new deep-blue iridium complex, Ir(dppfm)2pic, consisting of a phosphoryl group at the 3′-position of the phenyl ring and a methyl group at the 4-position of pyridine, was synthesized and characterized for applications in organic light-emitting diodes (OLEDs). Ir(dppfm)2pic exhibited an emission peak of 455 nm and high photoluminescence quantum yields of 73 %. Phosphorescent OLEDs based on Ir(dppfm)2pic exhibited a maximum external quantum efficiency of 7.8 % and Commission Internationale de l’Eclairage (CIE) coordinates of (0.15, 0.22). 相似文献
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We review recent advances in the spectroscopic properties of heteroleptic Ir(N^C)2(LX)-type iridium complexes, which are known as color-tuning materials. Most Ir(N^C)2(LX)-type Ir complexes give single emission, in accordance with Kasha’s rule. Dual emission, however, has been observed from a single Ir(N^C)2(LX) complex, depending on the choice of the N^C moiety and LX ligands. For example, Ir(dfppy)2(pq), Ir(ppy)2(dpq-3F), Ir(ppy)2(pq), and Ir(pq)2(tpy) (dfppy=2-(2,4-difluorophenyl)pyridine, pq=2-phenylquinoline, ppy=2-phenylpyridine, dpq-3F=2-(3-fluorophenyl)-4-phenylquinoline, tpy=2-p-tolylpyridine). Recently, triple emission was observed from Ir(ppy)2(BTZ)-type iridium complexes with two ppy ligands as (N^C)2 and one 2-(2-hydroxyphenyl)benzothiazole (BTZ) ligand, while quadruple emission from Ir(ppy)2Q-type iridium complexes with two ppy ligands as (N^C)2 and one quinolinolato (Q) ligand. These multiple emissions cover a spectral range from blue to red, leading to white emission. Of the four emission bands from Ir(ppy)2Q, the UV and violet emissions are attributed to the emission from the singlet states of IrQ and Ir(ppy), respectively, while the green and red emissions are attributed to emission from the triplet states of Ir(ppy) and IrQ. The appearance of the emission from each of the Ir(ppy) and IrQ (or Ir(BTZ)) components is understood by reduced Förster energy transfer between IrQ (or Ir(BTZ)) and Ir(ppy) due to an orientation factor of nearly zero, that is, due to orthogonality between the two ligand planes, while the appearance of both the fluorescence and phosphorescence bands from each of the ligands is understood by inefficient intersystem crossing from the upper singlet state to the lower triplet state. 相似文献
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Marion Graf Manuel Thesen Hartmut Krüger Peter Mayer Karlheinz Sünkel 《Inorganic chemistry communications》2009,12(8):701-703
The synthesis of the bis-cyclometalated complex [{Ir(μ-Cl)(ccpz)2}2] (1, cppz = 1-chloro-4-(4-chlorophenyl)-phthalazine) from hydrated iridium(III) chloride and the ligand ccpz in refluxing ethoxyethanol is described. Compound 1 was characterized by spectroscopic means and the crystal structure was determined by X-ray crystallography. The absorption and emission spectra exhibit the new compound as a red-emitting phosphorescent complex. 相似文献