Efficient blue emitters based on 1,3,5-triazine for nondoped organic light emitting diode applications

Two novel efficient blue emitters (TTT-1, TTT-2) containing 1,3,5-triazine, thiophene and triphenylamine have been designed and synthesized. Organic light emitting diodes (OLEDs) using these new triazine derivatives as emissive layers, ITO/TAPC (60 nm)/TTT-1 (Device A) or TTT-2 (Device B) (40 nm)/TPBi (60 nm)/LiF (1 nm)/Al (100 nm), were fabricated and tested. The OLEDs exhibited good performances with low turn-on voltage of 3 V, maximum luminance of ca. 8990 cd/m² for TTT-1 and 15,980 cd/m² for TTT-2, and maximum luminance efficiency of 4.7 cd/A for TTT-1 and 4.0 cd/A for TTT-2, respectively.     

Synthesis and Polymerization of 3-Octylsubstituted Thiophene,Bithiophene and Terthiophene

Abstract

The synthesis of 3-octyl-thiophene, 3,3′-dioctyl-bithiophene and 3,4′,3″-tri(3-octy!)-terthiophene has been carried out by using the cross coupling reaction, catalyzed by nickel. These oligomers were polymerized by chemical oxidative method with FeCl₃ and electrochemically. The products were characterized by UV. ¹H-NMR, ¹³C-NMR and GPC. The behavior and optical properties of the polymers obtained by different polymerization methodologies is discussed.     

Enhanced longterm stability of aluminum solid electrolyte capacitor containing thiophene derivatives as a solid electrolyte

The derivatives of thiophene, 3,4-ethylene-1-methyl-2-oxy-5-thio-thiophene (EMOTT) and 3,4-ethylene-1-propyl-2-oxy-5-thio-thiophene (EPOTT), are synthesized and then, 3,4-ethylenedioxythiophene (EDOT), EMOTT, and EPOTT are polymerized with ferric 4-methylbenzenesulfonate (oxidant) to obtain PEDOT-OMBs, PEMOTT-OMBs, and PEPOTT-OMBs, respectively. The surface conductivity of PEDOT-OMBs shows the highest value among the fabricated materials because PEDOT-OMBs shows the better defined crystalline structure and the doping concentration of PEDOT-OMBs is much higher than that of PEMOTT-OMBs and PEPOTT-OMBs. Capacitance and equivalent series resistance (ESR) of PEDOT-OMBs show the slightly enhanced value compared to PEMOTT-OMBs and PEPOTT-OMBs because of high electrical conductivity of PEDOT-OMBs. The PEDOT-OMBs shows the highest decrease rate of capacitance and increase rate of ESR because the extent of separation between the PEDOT-OMBs and the dielectric is much larger than that of PEMOTT-OMBs and PEPOTT-OMBs since it has the lowest density and hardness compared to other polymerized materials.     

矿物绝缘油中噻吩类非活性硫诱发绕组腐蚀的反应机理研究

矿物绝缘油中腐蚀活性较强的硫化物已被证实会诱发油浸式电力设备绝缘故障,在绝缘油精炼过程中会被去除。部分非活性硫因其高效抗氧化性保留于矿物绝缘油中以提高油品的氧化安定性。然而,非活性硫在油浸式电力设备运行条件下的活化问题及其对绝缘性能造成的影响并未得到关注。本文针对矿物绝缘油中的典型非活性硫噻吩类硫化物,聚焦油纸绝缘中非活性硫诱发绕组腐蚀的反应机理。采用材料物相分析方法探究噻吩类硫化物的热裂解产物,结合热解动力学分析方法,分析噻吩类硫化物在不同升温速率下的活化能变化规律,并开展非活性硫噻吩类硫化物在油纸绝缘热场作用下的试验研究。热裂解解气相色谱、质谱以及热解傅里叶红外光谱结果表明,噻吩类硫化物(噻吩、苯并噻吩、二苯并噻吩)在热解过程中的主要活化产物为具有极强腐蚀性与挥发性的H₂S。不同热解升温速率下,噻吩类硫化物的热重和微分热重曲线形状基本一致,其中噻吩最容易发生热解、其次是苯并噻吩、最后为二苯并噻吩。在油纸绝缘低温过热条件下,由于体系能量的不断积累,导致非活性硫噻吩类硫化物会发生活化进而生成低分子强腐蚀性硫化物,加剧了油品腐蚀性,最终导致油纸绝缘发生硫腐蚀。