蓝光高分子电致发光材料研究进展

实现高分子材料稳定高效的蓝光发射对于实现高分子电致发光器件的全彩显示至关重要,也是目前制约高分子电致发光器件走向商业化应用的重要影响因素之一.概述了聚芴类蓝光发射高分子功能材料的优缺点、应用前景及其研究进展,重点讨论了其光谱稳定性问题.     

高分子化学实验的绿色化开设——以可逆加成-断裂链转移(RAFT)聚合反应为例

目的探索高分子化学实验的绿色化开设途径。方法融合绿色化学理念,设计商用蓝光LED诱导的可逆加成-断裂链转移(RAFT)聚合的综合性高分子化学实验教学项目。结果在可见光照射下,仅有三硫代碳酸酯存在时,活性可控聚合制备出聚2-乙烯基吡啶。结论实验方法具有绿色、环境友好、反应条件温和、实验现象明显、实验操作简单易行等优点。     

烷氧基取代聚对苯乙炔发光二极管性能的研究

本文报道了采用脱氧缩合反应得到可溶于一般有机溶剂的聚对苯乙烯衍生物（ROPPV）的光电性质．材料先致发光光谱说明ROPPVR光峰在578mm在610nm处存在一个振动模式，以ROPPV作为发光层制备了发光二极管并对其特性进行了讨论．     

MgF_2薄膜器件的结构、导电和发光

通过蒸镀ＭｇＦ２薄膜制作了一种可均匀发射可见光的新型金属一绝缘体一金属结型发光器件。论证了它的内层结构、导电机理及其发光的物理图象：Ｓｃｈｏｔｔｋｙ热电子在Ａｕ－真空界面激发表面等离极化激元（ＳＰＰ）；Ａｕ－真空界面的ＳＰＰ通过表面粗糙度与外光子耦合。这一图象与该器件的电流－电压（Ｉ－Ｖ）、电流－温度（Ｉ－Ｔ）关系及其发射光谱的主要特征一致。     

Effective adjustment of the optoelectronic properties of organic conjugated materials by synthesizing <Emphasis Type="Italic">p</Emphasis>-<Emphasis Type="Italic">n</Emphasis> diblock molecules

Because organic conjugated materials offer several advantages relative to their inorganic counterparts,the development of organic conjugated materials has been one of the most active research areas in optoelectronic materials.For almost two decades,the search for organic conjugated materials has represented a major driving force for research concerned with controlling the band gap of extended π-conjugated molecules.In particular,among the parameters affecting the performance of organic light-emitting diodes (OLEDs),the energy levels of organic conjugated materials play an important role because they can affect the driving voltage,wavelength,efficiency,and lifetime of the final device.Balanced injection and transport of electrons and holes are therefore crucial for achieving OLEDs with high quantum efficiency.In this regard,research into adjusting the energy levels of organic conjugated materials is very meaningful for the development of OLEDs.To adjust the energy levels of the organic conjugated materials,Huang et al.have presented a new molecular design and synthesis route that yields p-n diblock conjugated copolymers and oligomers.The present review summarizes and analyzes the progress on adjusting the optoelectronic properties of organic conjugated materials that is due to synthesizing p-n diblock molecules.We discusses primarily work done by Huang et al.,but also discusses work done elsewhere over the past few years.We also point out issues that require attention,and highlight hot spots that require further investigation.     

White organic light-emitting devices fabricated by spin-coating molecular materials

White organic light-emitting device (WOLEDs) employing molecular mixed host (MH) is demonstrated by spin-coating.The spin-coated film functions as light-emitting layer and hole transporting layer,with the former formed by spin-coating solution containing MH of NPB (N.N'-Bis(naphthalene-1-yl)-N,N'-bis(phenyl)-benzidine) and MADN (2-methyl-9,10-di(2-naphthyl) anthracene),blue dye (4,4'-bis[2-(4-(N,N-diphenylamino)phenyl)vinyl]biphenyl) and yellow dye (5,6,11,12-tetraphenylnaphacene).The performances of the de...     

一种远程LED照明监控系统的设计

利用STC单片机结合以太网驱动模块,设计一种基于以太网的远程发光二极管(LED)照明监控系统.该以太网驱动模块由RTL8019以太网芯片及相关外围电路组成,利用电量采集芯片AD7755对整个系统所耗电量进行采集,采用大功率LED恒流驱动方案,并利用可调光芯片CAT4109和脉宽调制(PWM)技术对LED灯实现调光.结果表明:设计的系统可实时采集系统所耗电量,可对灯的亮度、色温进行远程调节.     

High-efficiency conjugated-polymer-hosted blue phosphorescent light-emitting diodes

Highly-efficient blue phosphorescent light-emitting diodes were fabricated based on a conjugated-polymer host by doping bis(2-(4,6-difluorophenyl)-pyridinato-N,C2’) picolinate(FIrpic) into poly(9,9-dioctylfluorene)(PFO).Previously,conjugated polymers were not considered as potential hosts for blue phosphorescent dyes because of their low-lying triplet energy levels.Energy back transfer would occur and lead to poor luminescent efficiency in both photoluminescence(PL) and electroluminescence(EL) processes.However,by inserting a hole-transporting layer of poly(N-vinylcarbazole)(PVK),the energy back transfer was suppressed.At low FIrpic-doping concentrations,PFO emissions were completely quenched;with 8 wt% FIrpic,a maximum luminous efficiency of 11.5 cd/A was achieved.     

近白光有机电致发光器件

利用高真空有机分子束沉积系统，我们选择了一种较好的蓝光材料4，4’-bis(2，2，’-diphenylbinyl)-1，1’-bipheny1(DPVBi)和黄光材料5，6，11，12，-tetraphenylnaphthacene(rubrene)采用适当的比例相混合产生白光效果，制备了近白光有机电致发光器件．在电压为16V时器件的亮度达到了最大值接近4272cd／m^2，器件的效率在电压为5V时为3．3cd／A，在电压为15V时器件的色坐标(0．34，0．36)，比较接近白光的等能点．     

Carbazole—containing light—emitting polymers：Properties of excited states

A series of light-emitting conjugated polymers alternatively involving carbazole and bivinylene arylene moieties in the main chain were synthesized via Wit-tig-Horner type copolymerization.The photoinduced charge transfer process relating to these polymers was investigated by using the technique of fluorescence spectroscopy.The interaction between excited copolymers and C60 in benzene solution was studied.The fluorescence quenching can be well described by the “sphere-of-action” mechanism.It is be-lieved that two basic steps are involved in the quenching process,i.e. the diffusion of excitation within the comjugated polymers and the dissociation of the exctions trapped by fullerene,The radius of the sphere-of-action can be related to the excitation diffusion length,which depends on the lifetime of the exciton.The dynamic fluorescence quenching of the copolymers by another quencher,1,4-dicyanobenzene(DCB) was also surveyed.Copolymers with different chain confor-mations show different temperature effects in the dynamic quenching.A planar conformation is beneficial for the quenching via bimolecular collision.