Improved Synthesis Of New Red Fluorescent Dye Dcjtb

The organic light-emitting diode has many advantages such as self light -emission,quick response high efficiency,low drive-voltage, low energy-consumption, and low cost, etc. The organic light-emitting diode, a research hotspot in recent years in the world, have been developing from the step of research to industrialization. In the full-color display based on tichromatic including red, green and blue, one of the greatest challenge in the field of OLED is to search the red dystuff which could meet the demand of utilization. Due to the long wavelength of the PL from the charge transfer in the molecular, DCJTB is a kind of excellent red dystuff,and it is used wildly. However, this kind of fluorescent dyestuff also has many disadvantages: (1) synthetic procedures and purification for DCJTB are complicated and would significantly increase the production cost for red OLEDs. (2) The yield of the production is low. Synthetic procedures for DCJTB are improved in this paper.In this paper, the research background and the fluorescent mechanism of DCJTB (4-(dicyanomethylene)-2-t-butyl-6(1,1,7,7-tetramethyljulolidyl-9-enyl)-4H -pyran) are reviewed. DCJTB is a new kind of excellent red-fluorescent dyestuff. According to the approaches used in some references, some intermediates were designed and obtained. Some synthesizing methods of the intermediates were optimized with the yield increased significantly. DCJTB was obtained by applying the reactions of aldol condensation, substituent, Knovenagel, Vilsmelier combined with some experimental methods of refluence, recrystalization, extraction, distillation etc.Synthetic procedures for DCJTB are improved by changing solvent, ratio among the reactors, reaction temperature and times etc. At last, the prime reaction conditions are found. The structures of the production are confirmed by IR and ~1HNMR and so on.