有机发光二极管显示屏的喷墨打印研究与展望

近年来,有机发光二极管(OLED)被广泛应用于智能手机等中小尺寸显示屏,并逐步进入电视等大尺寸显示领域和照明市场。随着OLED平板显示新时代的到来,对显示屏的彩色化与图案化研究提出了更高要求。与传统真空蒸镀技术相比,喷墨打印技术更容易实现大面积器件的彩色化和复合功能材料的图案化,且工艺简单,成本低廉,并可进行柔性器件加工。本文综述了采用喷墨打印技术制备OLED显示屏的研究现状,并系统介绍了喷墨打印设备的发展历程,通过优化bank结构提高显示屏的分辨率,优化墨水配方及组成配比抑制喷墨液滴的“咖啡环”效应,从而提高显示器发光均匀性,最后对国内外该技术产业进行了概述与展望。     

Photochemical activities of polymers with aurone fragment

ABSTRACT

In this work we report preliminary results obtained for methacrylic polymers incorporating aurone side-group as photochemical active molecule. The aurone polymers were obtained by a three-step synthetic approach: (2Z)-6-hydroxy-2-(4-R-benzyliden)-1-benzofuran-3(2H)-ones were synthesized by using condensation reation of 6-hydroxybenzofuran-3-one with benzaldehydes; then methacrylate monomers were synthesized by reaction the alcohols with methacryloyl chloride; and the polymers were synthesized by free radical polymerization. Polymers were characterized by ¹HNMR spectroscopy and DSC techniques. Their physicochemical properties are determined by absorption, fluorescence excitation and emission spectroscopies.     

Synthesis and fluorescent properties of bis-salicyloyl hydrazide metal complexes of some group Ⅳ ions

Four novel organometallic compounds containing tin(Ⅳ),titanium(Ⅳ) and zirco-nium(Ⅳ) ions were synthesized and strong fluorescent emission was observed from two tin(Ⅳ) complexes.     

二维配合物[Cd(mpac)(4，4-bpy)(OH)]n的合成，晶体结构和荧光性质

溶剂热条件下采用Cd(NO3)2.4H2O,5-甲基吡嗪-2-甲酸和4,4-联吡啶作为反应物合成出一个新的具有二维层状结构的镉金属配位聚合物[Cd(mpac)(4,4-bpy)(OH)]n(1),并分别用元素分析,红外光谱,热重分析和X-射线单晶衍射表征该结构。晶体结构分析结果表明:5-甲基吡嗪-2-甲酸将Cd(Ⅱ)离子连接成一维链,这些链进一步被4,4-联吡啶连接成二维层状结构。在二维层状结构中存在大小为0.24×1.16 nm2的一维通道。荧光谱图表明常温固态下配合物1发射蓝色荧光。     

配位聚合物[Cd2(BDC)2(obix)2]·H2O的合成、晶体结构和荧光性质

用水热合成方法得到1个新的配位聚合物[Cd2(BDC)2(obix)2]·H2O(H2BDC=对苯二甲酸,obix=1,2-(二亚甲基)二咪唑).配合物晶体属三斜晶系,P1空间群.晶体结构表明:镉原子与3个对苯二甲酸上的5个氧原子,2个1,2-(二亚甲基)二咪唑中的2个氮原子配位形成扭曲的五角双锥配位构型.2个Cd(Ⅱ)原子通过两个羧基桥联形成一个双核Cd2单元,再通过配体连接成二维层状结构,层与层之间通过C-H…O氢键和弱的π-π相互作用形成三维超分子结构.室温下配合物具有较强的荧光发射光谱.     

苯基多羧酸及含氮配体构筑的三维框架结构锌配位聚合物的合成、晶体结构和荧光性质

以醋酸锌、5-溴-1,2,4-苯基三羧酸(BTCAH₃)和4,4’-联吡啶(4,4’-bipy)为原料,在水热条件下合成了1个三维框架结构化合物[Zn₃(BTCA)₂(4,4’-bipy)₂](1),利用红外光谱、元素分析、热重、X-粉末衍射以及X-单晶衍射对该化合物进行了表征。化合物1是单斜晶系,C2/c空间群。在化合物1中,锌离子通过BTCA^3-配体的羧酸氧原子形成一个具有3-节点、4-连接的三维框架结构。4,4’-联吡啶配体在框架结构中连接锌离子。另外,研究了该化合物的热稳定性和固体荧光性质。     

两个基于羧基-水分子链构筑的超分子镉配合物的合成、晶体结构和荧光性质

以5甲基-3-吡唑甲酸(H₂MPCA)为主配体,在螯合配体菲咯啉(phen)或2,2'-联吡啶(2,2'-bpy)的存在条件下,与醋酸镉在常温下反应得到2个基于氢键构筑的羧基-水分子链的超分子化合物,[Cd(HMPCA)₂(2,2'-bpy)]·2H₂O(1)和[Cd(HMPCA)₂(phen)]·2.5H₂O(2),并通过元素分析、红外光谱、热重分析、X-射线衍射等对其结构进行了表征.结构分析表明,在化合物1和2中,单核镉的配合物和游离水分子通过氢键及π…π堆积作用形成了三维超分子结构,在此过程中,游离水和羧基构筑的链状水分子簇起着非常重要的作用.此外,我们还研究了化合物1和2的热重和荧光性质.     

Tunneling Processes and Anomalous Fading in Natural Feldspars Extracted from Quaternary Deposits

Reasons for a temporal decrease (fading) in the accumulated energy in feldspars used as paleodosimeters are considered. The tunneling processes capable of leading to fading as well as temperature and time dependences of tunnel afterglow have been studied in detail. It is shown that this glow bears no direct relation to the possible tunnel depletion of the dosimetric trapping centers. With a view toward directly observing tunneling from these centers, the temperature dependences (from −200°C to +100°C) of the intensity of the luminescence stimulated in the IR band with λ ≈ 900 nm (of the optically stimulated luminescence (OSL) signal) have been studied in detail. Within the limits of sensitivity of the equipment used, tunneling from the dosimetric centers has not been detected. It has been inferred that in fading of the OSL signal, an essential role can be played by the traps that are depleted at 200°C and have a lifetime of about 2 years at room temperature.__________Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 72, No. 2, pp. 207–212, March–April, 2005.     

A novel path to luminescent hybrid molecular materials: modifying the hydroxyl group of 6‐hydroxynicotinic acid by grafting to a silica network

In this paper, a novel path was put forward to modify the hydroxyl group of 6‐hydroxynicotinic acid by 3‐(triethoxysilyl)‐propyl isocyanate and prepare the corresponding organic–inorganic molecular‐based hybrid material with the two components connected by covalent bonds. The bridging unit is a derivative of 6‐hydroxynicotinic acid that is utilized to coordinate to Tb³⁺ via hydrolysis and polycondensation processes with functional triethoxysilyl groups. Ultraviolet absorption, phosphorescence spectra and luminescence spectra were applied to characterize the photophysical properties of the hybrid material obtained and the spectroscopic data show that the triplet energy of modified 6‐hydroxynicotinic acid efficiently initiates the antenna effect and matches the emissive energy level of the metal ions. As a result, the intramolecular energy transfer process is completed within these molecular‐based hybrids. Copyright © 2005 John Wiley & Sons, Ltd.