PVK∶DBVP掺杂体系的能量转移及发光性质的研究

研究了不同比例的PVK与齐聚PPV衍生物DBVP掺杂体系的能量转移和发光特性.通过对PVK,DBVP及PVK:DBVP掺杂体系的UV-vis,PL和PLE光谱的研究,分析了PVK与DBVP之间的能量转移过程.利用PVK在体系中类似于溶剂的分散作用,制备了结构为ITO/PEDOT/PVK:DBVP/LiF/Al的电致发光器件,研究了掺杂体系的电致发光性能.结果表明,在掺杂体系的光致发光和电致发光中,PVK的发射被有效地抑制,PVK与DBVP之间发生了非常有效的能量转移,通过调节PVK与DBVP的比例,可以获得蓝色和绿色发光,同时可以改善器件的发光性能,当PVK与DBVP的重量比为1∶2时,器件的绿色发光效率达到1·06cd/A,此时发光亮度为52cd/m2.     

Poly(N‐vinylcarbazole) chemically modified graphene oxide

A new soluble donor‐acceptor type poly(N‐vinylcarbazole)‐covalently functionalized graphene oxide (GO‐PVK) has been synthesized by reaction of DDAT (S‐1‐dodecyl‐S′‐(α,α′‐dimethyl‐α″‐aceticacid)trithiocarbonate)‐PVK with GO‐toluene‐2,4‐diisocynate. The incorporation of sufficient amount of PVK chains makes the modified GO nanosheets readily dispersible in organic solvents. The resulting material exhibits an enhanced solubility of 10 mg/mL in organic solvents. Covalent grafting of PVK onto the edge and surface of GO nanosheets did not change the carbazole absorption in the ultraviolet region, but substantially reduced the absorption intensity of GO in the visible region. The intensity of the emission band of GO‐PVK at 437 nm was a little bit quenched when compared with that of DDAT‐PVK, suggesting intramolecular quenching from PVK to GO. Such intramolecular quenching process may involve energy or electron transfer between the excited singlet states of the PVK moiety and the GO moiety. The HOMO/LUMO values and the energy bandgap of GO‐PVK experimentally estimated by the onset of the redox potentials are ?5.60, ?3.58, and 2.02 eV, respectively. © 2010 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 48: 2642–2649, 2010     

C60与聚乙烯咔唑（PVK）键合物和共混物在紫外激光作用下的碳笼增强融合

用飞行时间质谱测量３０８ｎｍ激光熔蚀Ｃ６０化学修饰的聚乙烯咔唑（Ｃ６０－ＰＶＫ）与Ｃ６０／聚乙烯咔唑共混物（Ｃ６０／ＰＶＫ）的产物分布，分析了正负离子质谱，发现明显的碳笼融合现象。比较分析了融合过程的增强机理，认为Ｃ６０与ＰＶＫ间的化学键合以及电荷转移络合分别在Ｃ６０－ＰＶＫ键合物和Ｃ６０／ＰＶＫ共混物的富勒烯融合过程中起了重要作用。     

掺杂聚合物蓝光发光二极管

报道了用有机染料ＴＰＢ（１，ｌ，４，４－四苯基丁二烯）分散到ＰＶＫ（聚乙烯基咔唑）中的掺杂聚合物作有源层制作的蓝光发光二极管及其发光特性。聚合物发光层用旋转涂敷的方法制备，用透明导电材料ＩＴＯ（铟锡氧化物）、金属Ａｌ作为正负电极。器件正向偏压为１３Ｖ时，可以看到蓝光发射，峰值波长为４５５ｎｍ，注入电流为５０ｍＡ／ｃｍ２时，亮度为４４ｃｄ／ｍ２。     

Mass spectrometric investigation of the aggregation and coalescence of fullerenes in C60-modified poly(N-vinylcarbazole) by UV-laser ablation

The phenomena of aggregation and coalescence of fullerenes in the UV-laser ablation time-of-flight mass spectrometric investigation of C₆₀-modified poly(N-vinylcarbazole) both in the positive and in the negative ion channels have been observed. The results indicate that in C₆₀ chemically modified PVK (C₆₀–PVK) copolymer the nascent fullerene fragments ruptured from main chain can easily coalesce into large fullerenes through collisions, whereas in the C₆₀-doped PVK the aggregation and coalescence of C₆₀ were relative weak due to nonbounding action and incomplete charge transfer behavior between C₆₀ and PVK. Furthermore, the photoinduced electron transfer behavior between C₆₀ and carbazole units in the C₆₀ chemically modified poly(N-vinylcarbazole) in benzonitrile by laser flash photolysis at 355 nm has also been investigated. Efficiency of the anion radical of C₆₀ in copolymer at 1080 nm is higher than that of the C₆₀-doped poly(N-vinylcarbazole) polymers. The formation of a C₆₀ radical anion may be ascribed to photoinduced electron transfer between C₆₀ pendanted on the main chain backbone and the inter-, and intrachain carbazole units in the copolymer. © 1997 John Wiley & Sons, Inc. 35 : 1185–1190, 1997     

多孔硅/多孔氧化铝与PVK复合光致发光特性

用旋涂法实现了多孔硅、多孔氧化铝与聚乙烯咔唑(PVK)的复合,研究了多孔硅／PVK、多孔氧化铝／PVK复合体系的光致发光性能。PL谱的测试发现,多孔硅／PVK复合体系的PL谱同时具有多孔硅和PVK的发射峰。此外,在485nm的位置出现了一个新峰,讨论了这个峰的来源。而多孔氧化铝与PVK复合后,没有产生新的峰。但多孔氧化铝与PVK复合后,由于多孔氧化铝纳米孔的纳米限制效应使PVK的发光峰出现大幅度蓝移。从多孔硅与多孔氧化铝发光机制的不同出发,讨论了多孔硅、多孔氧化铝与PVK复合后产生不同结果的原因。     

聚乙烯咔唑LB膜的制备及其结构形态

利用LB技术，研究了具有光电活性的聚乙烯咔唑(PVK)的单分子膜及PVK与十八胺(ODA)混合分子膜的聚集结构形态．结果表明纯PVK分子由于弱的亲水作用可以形成较好单分子膜，此时PVK分子形成片状聚集；而在混合体系中，在一定比例下PVK形成颗粒状团聚．改变不同的比例可以得到不同的纳米图案，当PVK：ODA=10：1时形成尺寸较均一的纳米球状致密覆盖分子膜；当进一步增加PVK比例时，ODA不能再调控PVK聚集，混合膜表现出平坦的PVK，ODA分相片状聚集．     

Electroplex emission from a blend of poly(N-vinylcarbazole) and 2,9-dimethyl-4,7-diphenyl-1, 10-phenanthroline

The PL and EL spectra of poly(N-vinylcarbazole) (PVK) : 2,9-dimethyl-4,7-diphenyl-1, 10-phenanthroline (BCP) (1:1 w/w) film were found completely different. The PL spectrum is a single peak at 415 nm that originates from excitons emission from PVK, and the tail of the spectrum is suggested to be excimer emission from BCP molecules. However, a new emission at 595 nm was found in the EL spectra of devices ITO/PEDOT:PSS(50 nm)/PVK:BCP(1:1)(100 nm)/Al. After aggregate, exciplex and product of electrochemical reaction were ruled out, the new emission was proposed to be electroplex emission that occurred between PVK and BCP molecules. Under high voltage, only electroplex emission can be observed in the EL spectra.     

氟代⊥酰亚胺掺杂PVK薄膜的结构特性和光电导性能

采用一种新型的有机电子受体 N,N′-二 (五氟代苯基 ) - 3,4 ,9,10 -⊥四羧基二酰亚胺(DFPP) ,与空穴传输材料聚乙烯基咔唑 (PVK)掺杂复合 ,制备了单层有机光电导体 ,发现无论是在充正电还是在充负电情况下 ,该复合光电导体均表现出十分优异的光电导性能。结合 DSC、UV- Vis吸收、XPS和循环伏安等测试手段研究了 DFPP掺杂的 PVK薄膜的凝聚态、光学和电学性质 ,发现 DFPP与PVK形成了给体 -受体 (D- A)复合物 ,而且 DFPP分子可在薄膜中形成电子传输通道 ,由此使 DFPP掺杂 PVK薄膜具有高的光致激子分离效率和良好的电子传输能力     

Synthesis and characterization of light‐emitting oligo(p‐phenylene‐vinylene)s and polymeric derivatives containing three‐ and five‐conjugated phenylene rings. II. Electro‐optical properties and optimization of PLED performance

A series of multilayer polymeric light‐emitting diodes (PLEDs) containing an electron‐transporting layer (ETL), that is tris(8‐quinolinolato)‐aluminum(III) (Alq) and 2,2′,2″‐(1,3,5‐phenylene)‐tris[1‐phenyl‐1H‐benzimidazole] (TPBI), were fabricated by doping fluorescent oligo(p‐phenylene‐vinylene)s (BIII and BV) and polymer derivatives (PBV) into poly(N‐vinyl carbazole) (PVK). These PLEDs can be optimized by the design of multilayer device configurations (brightness increased 8–15 times by addition of ETL) and possess greenish electroluminescent (EL) spectra peaked about 500–540 nm. A remarkably high brightness of 56,935 cd/m² with a power efficiency of 3.25 lm/W was obtained in the device of PVK:BVOC₈‐OC₈ (100:20)/Alq (60 nm/60 nm). It suggests that the emission mechanism (including the conjugated and excimer emissions of BVOC₈‐OC₈ emitters) originates from both of BVOC₈‐OC₈ and ETL (Alq and TPBI) by varying the concentration of chromophores and adjusting the thickness of ETL. The concentration effect of the emitters in PVK (i.e. PVK:BVOC₈‐OC₈ = 100:5, 100:20, and 100:100 wt %) and the influence of the ETL (including its thickness) on the EL characteristics are also reported. © 2006 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 44: 2922–2936, 2006