为什么材料激子的单线态总是悲观负能量怎么办比三线态的能量高

聚乙炔激子单线态和三线态的稳态性质与零磁场判据_图文_百度文库
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聚乙炔激子单线态和三线态的稳态性质与零磁场判据
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&&在Su-Schrieffer-Heeger(SSH)模型基础上,计入弱电子关联的影响,研究聚乙炔单线态和三线态两类激子的行为.与单线态相比,三线态激子能级自旋简并丧失,能隙增大,电荷密度振荡局域分布以及自旋密度波产生,三线态激子吸收谱的相应特征峰发生~0.1 eV蓝移并且强度增加~40%.这些差异
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你可能喜欢&&方向一:有机发光二极管 Organic Light-Emitting Device, OLED
&年,邓青云博士等首次报道了有机发光二极管,拉开了研究的大幕。具有自发光性、广视角、高对比、低耗电、高反应速率、全彩化以及形状可控等优点,被誉为新一代显示与照明技术。结构通常为&三明治&结构,即有机发光层夹在正负电极之间。为了提高的效率以及稳定性,可以选择性地向其中加入电荷注入传输层形成多层结构。下图为结构的简化图。&&&&&& 从中可以看出,有机发光层在中居于核心地位,它既决定的的发光颜色,又在很大程度上决定了的发光性能。因此,自被发明以来,有机发光材料一直是领域的研究热点与重点。在研究的早期阶段,有机发光材料为荧光材料,其只能利用电场作用下产生的单线态激子发光电场作用下产生的激子大约有处于单线态,处于三线态,因而OLED发光效率较低。年,我国马於光等人以及美国等人以过渡金属有机配合物为发光材料分别实现了中三线态激子发光。由于可以同时利用电场作用下形成的单线态与三线态激子发光,基于过渡金属有机配合物磷光发光材料的在理论上可以达到的内量子效率。从此,发光材料的研究方向由传统单线态发光的荧光材料转向三线态发光的磷光材料。在上述背景下,研究组在过渡金属铱与铂有机配合物方面做了大量研究。通过功能化有机配体的思想,对这两类磷光配合物的发光效率、发光颜色以及电荷注入传输特性进行调控,取得较多研究成果并受邀在Chemical Society Reviews、Journal of Materials Chemistry C、Chemistry&An Asian Journal等多种权威化学及材料类学术期刊撰写相关综述。最近,研究组也开始研究有机铜配合物在方面的应用,取得较好研究成果。&
方向二:有机光限幅材料(Organic Optical Power Limiting Materials)&光限幅材料属于非线性光学领域,是指可以将超过能量阈值的入射光能量限制在一定的能量强度之内的材料,也即高能量的入射光通过光限幅材料形成低能量的输出光。下图为相关示意图。在科学研究以及工业生产中,常常会用到一些高能量的激光光源,利用光限幅材料制作出相应的保护装置可以保护激光操作者的眼睛以及一些激光探测器避免被激光损伤。因此,光限幅材料是非线性光学领域的一个研究热点。&课题组通过将有机芳炔与铂Pt(II)、金Au(I)以及汞Hg(II)等配合物结合在一起,研究出了一系列性能优异的有机光限幅材料。与传统的光限幅材料C60、金属卟啉化合物以及酞菁化合物相比,这些有机光限幅材料具有两个明显的优点:第一,较短的吸收波长,也即在可见光范围内具有很好的透过率;第二,更好的光限幅性能。总之,课题组在光限幅材料方面的研究取得了一系列较好的成果,研究成果发表在Angewandte Chemie International Edition、Advanced Functional Materials、Journal of Materials Chemistry C等多种权威化学及材料类学术期刊并受邀在Chemical Society Reviews撰写相关综述。
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Improve the Quantum Efficiency in O/PLED Using Triplet Exciton
利用三线态激子提高有机/高分子发光器件的量子效率
The advantage of phosphorescent materials is that they can utilize both singlet and triplet exciton states which can reach 100% internal quantum efficiency theoretically.
磷光材料在发光过程中可以利用单线态和三线态激子,理论上内量子效率达到100%,这类材料的使用成为提高器件效率的主要途径之一。
100% i nternal quantum efficiency is possible to be reached theoretically for effective
utilization of both singlet and triplet exciton states in these devices. In thi s paper, the development of organic small molecule electrophosphorescent device
and the light emitting mechanism are briefly introduced.
为突破这一理论极限,在小分子主体材料中掺杂磷光染料制成电致磷光器件是近几年研究的热点,磷光染料的掺杂可以充分利用单线态和三线态激子,理论上器件的内量子效率可以达到100%。
The influence of electric field introduced polymer molecular orientation on the formation cross-section of singlet and triplet excitons in PLED
电场诱导聚合物分子取向对单线态和三线态激子形成截面的影响
Given the complete intersystem crossing from the siglet to triplet and efficient intramolecular energy transfer from triplet to center ions, one can expect excellent performance of RE-complex-containing devices.
这是因为其具有如下特点:丰富的4f-4f跃迁覆盖从紫外到红外波段,窄谱带的发射有比较好的色纯度和色饱和度,激发态寿命长,且在有机电致发光(OEL)过程中稀土离子可以有效利用三线态激子能量发光,因而其电致发光的内量子效率理论上可以达到100%。
Phosphorescent electroluminescent materials and devices are one of prime focuses of organic light-emitting device research in recent years due to their ability to efficiently utilize both singlet and triplet excitons and having higher efficiency.
有机电致磷光材料可以同时利用单线态和三线态激子发光,具有发光效率高等优点,成为近年来研究的热点。
the density
the spin density wave emergenced and the calculated exciton absorbance for the triplet has a blue shift of ~800/cm,and its intensity raise ~40% with respect to the singlet.
与单线态相比,三线态激子能级自旋简并丧失,能隙增大,电荷密度振荡局域分布以及自旋密度波产生,三线态激子吸收谱的相应特征峰发生~0.1 eV蓝移并且强度增加~40%.
The static nature of singlet and triplet exciton in polyacetylene and zero-field criterion
聚乙炔激子单线态和三线态的稳态性质与零磁场判据
Improve the Quantum Efficiency in O/PLED Using Triplet Exciton
利用三线态激子提高有机/高分子发光器件的量子效率
EXCITON STATE DENSITY WITH ANGULAR MOMENTUM
具有角动量的激子态密度公式
The influence of electric field introduced polymer molecular orientation on the formation cross-section of singlet and triplet excitons in PLED
电场诱导聚合物分子取向对单线态和三线态激子形成截面的影响
STUDY ON THE QUANTUM YIELDS OF TRIPLET STATE FORMATION
三线态形成的量子产率研究
查询“三线态激子”译词为用户自定义的双语例句&&&&我想查看译文中含有:的双语例句
为了更好的帮助您理解掌握查询词或其译词在地道英语中的实际用法,我们为您准备了出自英文原文的大量英语例句,供您参考。&&&&&&&&&&&& Some conjugated polymers have luminescence properties that arepotentially useful for applications such as light
emitting diodes,whose performance is ultimately limited by the maximum quan
tum efiency theoretically attainable for electroluminescence[1, 2]. If the lowest
energy excited states are strongly bound excitons(electron
hole pairs in singlet or triplet spin states), this theor- etical upper limit is only 25%
of the corresponding quantum efficiency for photoluminescence: an electron in theπ
... Some conjugated polymers have luminescence properties that arepotentially useful for applications such as light
emitting diodes,whose performance is ultimately limited by the maximum quan
tum efiency theoretically attainable for electroluminescence[1, 2]. If the lowest
energy excited states are strongly bound excitons(electron
hole pairs in singlet or triplet spin states), this theor- etical upper limit is only 25%
of the corresponding quantum efficiency for photoluminescence: an electron in theπ
band and a hole (or missing electron) in theπ
band can form a triplet withspin multiplicity of three, or a singlet with spin multiplicity of one, but only the singlet will decay radiatively3. But if theelectron
hole binding energy is sufficiently weak, the ratio of the maximum quantum efficiencies for electroluminescence and photoluminescence can theoretically approach unity. Here we report a value of~ 50%
for the ratio of these efficiencies (electro
luminescence:photoluminescence) in polymer light
emitting diodes, attained by blending electron transport materials with the conjugated polymer to improve the injection of electrons. This value significantly exceeds the theoretical limit for strongly bound singlet and triplet excitons, assuming they comprise the lowest
energy excited states. Our results imply that the exciton binding energy is weak, or that singlet bound states are formed with higher probability than triplets.某些共轭聚合物具有发光性能,有望作为发光二极管之类应用,其性能主要受最大可能的理论电致发光效率的限制 [1, 2]。若最低能量激发态强束缚激子处于单线态或三线态下的电子-空穴对),则电致发光的理论上限仅为相应光致发光量子效率的 25%:即一个处于π?-带内的电子和一个处于π-带的空穴(或缺少电子态)可形成一种自旋多重性为 3的三线态,或一种自旋多重性为 1的单线态。只有单线态才能辐射跃迁而发光 [3]。如果电子-空穴对的束缚能足够  弱的话,电致发光和光致发光的最大量子效率之比理论上可接近于 1。在本文,我们将报导,若在  共轭聚合物内混入电子传输材料,则可改善电子注入特性,所得到的聚合物发光二极管的电致发光效率和光致发光效率之比可接近 50%。若假定它们处于最低激发态,这个值显然高于强束缚单线态和三线态激子的理论极限值。我们的的这个结果意味着,这种激子的束缚能很弱,或者是形成单线态的几率可能要比形成三线态的几率高得多。 Electroluminescent devices based on polymer/phosphorescent complexes have become a novel and attractive area of research in recent years. In this review, characteristics of both polymer matrices and phosphorescent dopants, the electrophosphorescent mechanism and device structure have been introduced. The advantage of phosphorescent materials is that they can utilize both singlet and triplet exciton states which can reach 100% internal quantum efficiency theoretically. The system requires polymer matrices satisfy... Electroluminescent devices based on polymer/phosphorescent complexes have become a novel and attractive area of research in recent years. In this review, characteristics of both polymer matrices and phosphorescent dopants, the electrophosphorescent mechanism and device structure have been introduced. The advantage of phosphorescent materials is that they can utilize both singlet and triplet exciton states which can reach 100% internal quantum efficiency theoretically. The system requires polymer matrices satisfy energy matching between polymer host and phosphorescent dopant and have good carrier mobility. All the phosphorescent materials can be used as dopants for EL devices, which is a significant advantage of polymer host over small molecule host. Grafting and incorporating phosphorescent polymers can be used as a novel kind of luminescence materials with less self?quenching and more efficient energy transfer. Electroluminescence of these devices is from both F?ster energy transfer and exciton directly recombination on the dopant, so it is necessary to be in view of the interaction and self?quenching of the excitons while designing the suitable structures of ?devices.?聚合物/磷光复合体电致发光是近几年来受到广泛关注的新兴领域。从主客体材料的特点、发光机理、器件结构几个方面综合阐述了该领域的研究概况。磷光材料在发光过程中可以利用单线态和三线态激子,理论上内量子效率达到100%,这类材料的使用成为提高器件效率的主要途径之一。聚合物母体的选择应满足能量匹配原理,并且应具有良好的载流子迁移性质。所有的磷光材料都能作为客体使用,这方面聚合物母体优于小分子母体。另外,枝化及高分子化的磷光材料既能抑制自猝灭,又能保证有效的能量转移,是一类大有前途的新型发光材料。由于器件的电致发光包括F ster能量转移和载流子直接在客体上复合两种机理,而磷光材料激发态的特点是长寿命,因此设计器件结构时应考虑激子的相互作用与猝灭问题。 The lower usability of triplet
exciton state energy always existed in the study of small molecule and polymer
OLEDs in past years. The 25% theoretical limit of the internal quantum efficienc y bothered the researchers as usual. Recently, electrophosphorescent devices bas ed on small molecule have become a novel and attractive area of research. 100% i nternal quantum efficiency is possible to be reached theoretically for effective
utilization of both singlet and triplet exciton states in these devices. In... The lower usability of triplet
exciton state energy always existed in the study of small molecule and polymer
OLEDs in past years. The 25% theoretical limit of the internal quantum efficienc y bothered the researchers as usual. Recently, electrophosphorescent devices bas ed on small molecule have become a novel and attractive area of research. 100% i nternal quantum efficiency is possible to be reached theoretically for effective
utilization of both singlet and triplet exciton states in these devices. In thi s paper, the development of organic small molecule electrophosphorescent device
and the light emitting mechanism are briefly introduced. The energy transfer bet ween the host and the guest will be demonstrated thoroughly. Some problems in de vice designing will be pointed out. The future of the OLEDs will be looked forwa rd at the end of this paper.在过去10余年对小分子和聚合物电致发光器件的研究中,由于器件三线态激子能量没有得到充分的利用,使器件的内量子效率存在25%的理论极限,大大限制了其发光效率。为突破这一理论极限,在小分子主体材料中掺杂磷光染料制成电致磷光器件是近几年研究的热点,磷光染料的掺杂可以充分利用单线态和三线态激子,理论上器件的内量子效率可以达到100%。本文针对有机小分子电致磷光器件的发展、发光机理以及主客体分子间的能量传递等方面作了简明的讨论,指出了在器件设计时应该注意的一些问题。&nbsp&&&&&相关查询
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