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胆甾型和向列型液晶的混合物中，制备了具有不同厚度和染料浓度的液晶（LC）电池。然后，测量了紫外光刺激下的荧光强度，并研究了这些细胞的复杂特性。制备了在衬底内表面形成荧光层的LC荧光器件，并测量了其荧光特性和荧光光谱对外加电压的依赖关系。在蓝光或紫外led和1w荧光灯的刺激下，测量了掺杂荧光染料的LC细胞和LC荧光器件中荧光强度和荧光光谱的外部电压依赖性。然后，研究了电控荧光强度的闭光效应和一些特性。通过将UV-LED和紫外荧光灯组合到掺杂荧光染料的LC细胞中，测量了荧光强度与荧光光谱和施加电压之间的关系。然后，制备了荧光色可由蓝变红或变绿的荧光器件，作为多色荧光LC显示器件进行了研究。此外，它们的荧光收率也得到了提高。荧光显示器件是由掺杂不同荧光染料的LC电池堆叠而成的。然后，测量了它们的荧光特性，并讨论了施加电压与GTE色坐标上荧光特性的关系。获得了最佳变色条件，可制成性能优良的荧光LC电池。对研究结果进行了检验，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.