厚膜電激發光元件螢光層之發光特性研究

厚膜電激發光（粉末型電激發光ACEL）元件，其具有重量輕、厚度薄、耗電量低等優點，符合目前光電產品所需之輕薄短小及綠能的需求，市面上常製作成燈具、顯示器之背光源、個人攜帶通訊電子產品光源等，然而確有原料成本太高及發光效率下降過快等問題的存在：本實驗採用螢光粉及其與粘著劑間不同配比和不同厚度之螢光層製作電激發光元件，探討外加電壓對其發光強度之影響，以尋求生產製造成本低、發光效果不錯之電激發光元件，並利用X-光粉末繞射儀（X-ray diffraction; XRD）鑑定樣品之晶體結構，以光激發光光譜儀（photoluminescence; PL）分析螢光粉之激發光譜及放射光譜特，以掃瞄式電子顯微鏡（scanning electron microscope;SEM）進行樣品表面和剖面形態分析，以照度計（Lux meter）來量測樣品發光強度：實驗結果顯示，螢光粉與粘結劑，分別以7:3、1:1、2:3及1:2等四種配比（重量比）製作之較薄螢光層的發光元件之相對發光強度，隨著施加電壓之增加而增加到最高時，螢光層螢光粉所佔之配比愈高之發光元件其發光強度亦愈高，但隨著厚度（層數）愈增加時，高配比螢光粉之螢光層製作出的發光元件之發光強度反而愈低。

關鍵字

電激發光；螢光粉；硫化鋅；介電材料；鈦酸鋇

並列摘要

Thick-film electroluminescence (so-called AC Powder Electroluminescence) devices have many advantages of being light weight, thin thickness, and low power consumption. They are in a great demand for optoelectronic products. However, they are high cost rare materials with unsustainable degrading efficiency. In this research, we manufactured the electroluminescence devices using several phosphor powders with varying weight % of binders and thickness of phosphor layers. We used X-ray diffractiometer (XRD) to determine the crystal structure of the phosphors; spectrophotometer (PL) to verify the excitation and emission spectrums of the phosphors; scanning electron microscope (SEM) to analyze the surface appearance, crosssectional structure, and crystal size of the phosphors; and digital lux meter to determine the luminous intensity. Analysis of these laboratory data showed that thinner phosphor layer when combined with phosphor powders and binder with 7:3, 1:1, 2:3, and 1:2 weight ratios, the luminous intensity increased with increasing phosphor weight % and increasing input voltage. The luminous intensity decreased with increasing number of phosphor layers and phosphor weight %. These findings gave us some ideas how to manufacture low cost and high efficiency thick-film electroluminescence devices.

並列關鍵字

Electroluminescence ； Phosphor Pouders Zinc Sulfide ； Dielectric materials ； BkTio3

國際替代計量

厚膜電激發光元件螢光層之發光特性研究

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