中位四(1-苯基吡唑-4-基)卟啉掺杂空穴传输材料的红色有机电致发光器件(英文)

使用中位-四(1-苯基吡唑-4-基)卟啉(TPPyPH2)掺杂空穴传输材料N,N′-二苯基-N,N′-双(4-甲苯基)-1,1′-二苯基-4,4′-二胺(TPD)制备了红色有机电致发光器件.因为TPD的发射光谱与TPPyPH2的吸收光谱具有更大的光谱重叠,为了得到更为有效的从主体材料TPD向红光染料TPPyPH2的能量传递,我们使用TPD代替传统的8-羟基喹啉铝(Alq3)作为主体发光材料.器件在680nm处具有纯的红光发射峰;通过使用Alq3电子传输层以及使用Alq3共掺杂发光层的方法,使器件的发光性能得到了改善,结构为ITO/Alq3+TPPyPH2+TPD(50nm)/Alq3(30nm)/Al的器件的最大发光亮度为177cd/m2.     

Synthesis,Acidity Constants and Tautomeric Structure of 7‐Arylhydrazono[1,2,4]Triazolo[3,4‐b][1,3,4]thiadiazines in Ground and Excited States

7‐Arylhydrazono[1,2,4]triazolo[3,4‐b][1,3,4]thiadiazines 4 were synthesized from the reactions of 4‐amino‐5‐phenyl‐4H‐[1,2,4]triazole‐3‐thiol 2 and 2‐(2‐naphthyl)‐2‐oxoethanehydrazonoyl bromides 1 and their acid dissociation constants pK and pK*, in the ground and excited states, respectively, were determined. Both pK and pK* constants were correlated by Hammett equation. The pK and the spectral data presented indicate that the title compounds exist predominantly in the hydrazone tautomeric form.     

刚性溶液中分子间能量传递的研究

本文应用了荧光光谱和时间分辨的荧光光谱技术研究了1,4-二苯乙烯基苯(给体)与吖啶黄(受体)在乙醇的刚性溶液中分子间能量传递的行为,探讨了分子的浓度、给体、受体分子间的实际距离 R、临界距离 R_0与能量传递效率 E_T、能量传递速率常数 K_T 之间的关系。     

《印度之行》:爱的渴望,友谊的追寻

爱·摩·福斯特的《印度之行》,探索了英印之间建立友谊的可能性与沟通的艰难性。小说中主要人物的人道思想,英国人和印度人之间的融合,人类与神、人类与自然之间的融合,生动地反映出人类的美好愿望与理想——对爱的渴望和对友谊的追求,揭示了该小说的主题。尽管阻碍友谊建立的社会、政治、文化等因素依然存在,完美的和谐、统一尚未完全形成,但他们在通向英印互相沟通、理解的路上都努力走了很远很远。     

无言的回声--试析福斯特《印度之行》中穆尔夫人的精神困惑

穆尔太太是福斯特《印度之行》中最具有同情心的人物，在经历了马拉巴山洞之后，她与儿子伦尼的最后一次谈话时的独自流露出她的精神困惑。她提出一系列的质疑都被回声反射回来而没有作答，因此她对自身的观念的质疑、对基督教思想意识的质疑、对爱是否存在的质疑都在独自中淋漓尽致地体现出来。穆尔太太的精神最后在回声的影响下崩溃，并最终走向死亡。     

Chiral banana liquid crystals derived from sugars

This paper describes the synthesis and physical properties of a chiral bent-core liquid crystal containing the chiral non-aromatic central ring system 1,5-anhydro-2-desoxy-D-arabino-hexitol. The preparation involved a stepwise construction of the mesogenic side chains via a selective diesterification of glucal at positions three and six with 4-O-acetylbenzoyl chloride followed by selective deacetylation. Repeated esterification of the aromatic hydroxy group with a substituted benzoic acid and hydrogenation of the double bond resulted in the desired product. To our knowledge, this is the first banana shaped liquid crystal synthesized containing a sugar derivative as a chiral core. Investigation of the mesogenic properties and electro-optic experiments showed traditional calamitic phases along with banana phases.     

Energy transfer process between Eu3+ and wide-band-gap SnO2 nanocrystals in silica films studied by photoluminescence excitation and time-resolved photoluminescence techniques

Eu3+ions embedded in silica thin films codoped with SnO2 nanocrystals were fabricated by sol–gel and spin-coating methods.SnO2 nanocrystals with controllable sizes were synthesized through precisely controlling the Sn concentrations.The influences of doping and annealing conditions on the photoluminescence intensity from SnO2 nanocrystals are systematically investigated.The effective energy transfer from the defect states of SnO2nanocrystals to nearby Eu3+ions has revealed by the selective photoluminescence excitation spectra.The efficiency of the Forster resonance energy transfer is evaluated by the time-resolved photoluminescence measurements,which is about 29.1%based on the lifetime tests of the SnO2emission.