- 學位論文
電激發光元件中發光層與絕緣層之黏結劑對發光性質之影響
Luminescence Characteristics of the Binder of Phosphor and Insulate Layers in Electroluminescence Devices
摘要
電激發光裝置是可撓性的面光源，重量輕、厚度薄、亮度高且方便攜帶，常利用於製作燈具、顯示器之背光源、行動電話等電子產品，但是有原料成本過高及發光效率下降過快的缺點。 本實驗使用不耗能的手動網版印刷來製作層狀的電激發光元件，其中黏結劑扮演重要的角色，分別與螢光粉及介電材料混合成漿料，來製作發光層與絕緣層，最後用以銀漿塗佈當作導電層。由於原料成本高，本實驗著重於黏結劑與發光層及絕緣層之粉膠比來探討其發光性質。 本實驗使用三種黏結劑，分別為環氧樹脂、PU樹脂及蓖麻油，與螢光粉及鈦酸鋇（介電材料）以粉膠比2：3及3：7（wt%）混合，來塗佈發光層與絕緣層，在不同電壓及頻率下量測光照度，來分析各種組合電激發光元件之發光強度。 實驗結果顯示，發光層最佳的參數是螢光粉與環氧樹脂混合2：3（wt%），絕緣層最佳的參數是鈦酸鋇與環氧樹脂混合2：3（wt%），上述兩者組合的電激發光元件有最好的發光效率，照度是所有組合中最高的61.7 lux，起始電壓也最低只需11.3 V。
並列摘要
The electroluminescence device belong to surface light sources with flexible feature；They are light weight, thin thickness, high brightness, and easy to carry. Usually the electroluminescence devices are used in lamps, backlight of flat display and portable electronic products. However the higher cost of raw materials and faster degradation of efficiency are the key issues. The multi-layer electroluminescence devices were produced using manual screen-printing process, which is non-energy-consumption. Binders play an important role in producing electroluminescence device as a medium. They are combined individually with phosphor powders and dielectric powders in order to fabricate phosphor layers and insulate layers. Let the silver plastic to take as conductive layer at last. Due to the high cost of raw materials, this research will focus on the binder and phosphor and insulate layers of different powder-binder ratio to investigate the luminescence characteristic. This experiment using three kinds of binders, and they are epoxy resin, PU resin, castor oil, respectively. Three binders were mixed with phosphor powders（ZnS：Cu）and dielectric powders（BaTiO3）to screen-printing phosphor layers and insulate layers, respectively, and then measure the illumination under various voltage and frequency to analyze different combinations of electroluminescence device of the luminescence characteristic. According to the experimental results show that the best parameter of the phosphor layer was phosphor powders mixed with epoxy resin at 2：3（wt%）,and the best parameter of the insulate layers was BaTiO3 powders mixed with epoxy resin at 2：3（wt%）. The electroluminescence devices have the best luminescence characteristic of the combination of the above-mentioned two parameters, which has the highest illumination（61.7 lux）,and the lowest threshold voltage（11.3 V）.