White electrolumineseence from a single-polymer system with simultaneous two-color emission: Polyfluorene as the blue host and a 2,1,3-benzothiadiazole derivative as the orange dopant on the main chain

New single-polymer electroluminescent systems containing two individual emission species - polyfluorenes as a blue host and 2,1,3-benzothiadiazole derivative units as an orange dopant on the main chain - have been designed and synthesized. The resulting single polymers are found to have highly efficient white electroluminescence with simultaneous blue(lambda(max) = 421 nm/445 nm) and orange emission (lambda(max) = 564 nm)from the corresponding emitting species. The influence of the photoluminescence (PL) efficiencies of both the blue and orange species on the electroluminescence (EL) efficiencies of white polymer light-emitting diodes (PLEDs) based on the single-polymer systems has been investigated. The introduction of the highly efficient 4,7-bis(4-(N-phenyl-N-(4-methylphenyl)amino)phenyl)-2,1,3-benzothiadiazole unit to the main chain of polyfluorene provides significant improvement in EL efficiency. For a single-layer device fabricated in air (indium tin oxide/poly(3,4-ethylenedioxythiophene): poly(styrene sulfonic acid/polymer/Ca/Al), pure-white electroluminescence with Commission Internationale de l'Eclairage (CIE) coordinates of (0.35,0.32), maximum brightness of 12 300 cd m(-2), luminance efficiency of 7.30 cd A(-1), and power efficiency of 3.34 lm W-1 can be obtained.

一种用高效液相色谱分析1,3-二氨基硫脲的方法

一种用高效液相色谱分析１，３－二氨基硫脲的方法，选取Ｚｏｒｂａｘ－ＯＤＳ为色谱柱担体，用甲醇和水配制成移动相，在高效液相色谱仪上用紫外多波长检测器进行检测，以色谱外标法进行定量。本发明具有产品分析仪器化；分析结果误差小；分析过程快速，方便易操作；不仅可以检测１，３－二氨基硫脲产品的纯度，还可用于检测含有微量１，３－二氨基硫脲的溶液及废液中１，３－二氨基硫脲的含量的优点。