Research and Developments of Multi-Color Fluorescent Display Devices by Using Light Emitting Diode and Liquid Crystals

1.通过将一些荧光染料溶解到双相液晶和双相液晶的混合物中来制备具有各种LC层厚度和染料浓度的液晶（LC）盒。在此基础上，测量了细胞在紫外光激发下的荧光强度，研究了细胞的复杂性质.制备了在基片内表面形成荧光层的液晶荧光器件，测量了其荧光特性和荧光光谱随外加电压的变化.在蓝光或紫外LED和1 W荧光灯的激励下，测量了掺杂荧光染料的液晶盒和液晶荧光器件的荧光强度和荧光光谱的外电压依赖性。研究了光屏蔽效应和电控荧光强度的一些特性.通过将UV-LED和UV-荧光灯组合到掺杂有荧光染料的LC单元，测量荧光强度和荧光光谱与施加到LC单元的电压之间的关系。然后，制备荧光颜色可以从蓝色变为红色或变为绿色的荧光器件，并将其作为多色荧光LC显示器件进行研究。此外，它们的荧光产率也有所提高.具有彩色特性的荧光显示器件由堆叠多个掺杂有不同荧光染料的LC单元组成。然后测量了它们的荧光性能，并讨论了GTE色坐标上施加电压与荧光性能之间的关系。获得了颜色变化的最佳条件，可以组成性能优良的荧光液晶盒。6.对结果进行了检验，并对研究工作进行了总结.

1. Liquid crystal (LC) cells with various thicknesses of LC layers and dye concentrations are prepared by dissolving some fluorescent dyes into mixtures of cholesteric and nematic LCs. Then, fluorescent intensities stimulated by ultraviolet (UV) light are measured and characteristics in complex properties of these cells are studied.2. LC fluorescent devices of which fluorescent layers are formed on the inside surface of the substrates are prepared, and their dependences of fluorescent properties and fluorescent spectra on the applied voltage are measured.3. External voltage dependences of fluorescent intensities and fluorescent spectra in both of the LC cells doped with fluorescent dyes and LC fluorescent devices are measured under the stimulation by the blue or UV-LED and the 1W-fluorescent lamp. Then, light shuttering effects and some properties of electrically controlled fluorescent intensities are studied.4. Relations between fluorescent intensities and fluorescent spectra and applying voltages to the LC cells are measured by composing the UV-LED and UV-fluorescent lamp to the LC cells doped with the fluorescent dyes. Then, fluorescent devices of which fluorescent color can be changed from blue to red or to green are prepared and studied as multi-color fluorescent LC display devices. In addition, their fluorescent yields are improved.5. Fluorescent display devices having colorful properties are composed by stacking several LC cells doped with different fluorescent dyes. Then, their fluorescent properties are measured and relations between applied voltages and fluorescent properties on GTE color coordinates are discussed. Optimum conditions for color changes are obtained, and fluorescent LC cells with excellent properties can be composed.6. The results are examined and the research work is summarized.