厚膜電激發光元件螢光層之發光特性研究

The Luminescence Characteristics of Phosphor Layers in Thick-Film Electroluminescence Devices

楊挺(Ting Yang)

指導教授 ： 唐自標

國立臺北科技大學/工程學院/材料科學與工程研究所/碩士(2011年)

https://doi.org/10.6841/NTUT.2011.00571

摘要

厚膜電激發光（粉末型電激發光ACEL），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。

本實驗採用不同之螢光粉及其與粘著劑間不同配比製作電激發光元件，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色，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及觀察其粒徑大小，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

The thick-film electroluminescences (so-called AC Powder Electroluminescence) possess the advantage of light weight, thin thickness, low power consumption…etc. To be in line with the demand in current Optoelectronics and green-energy market, the products require smaller volume with the above-mentioned features. Usually the electroluminescencesare used in lighting, backlight of screen panel and portable electronic devices. However, the higher cost of rare materials and faster degradation of efficiency are the key issues.

In this research, the electroluminescences were produced by means of different kinds of phosphor powders with different formulawt% to analyze the influence upon input voltage and luminous intensity. The major purposes are to seek for low cost and high efficiency. The crystal structure of the phosphors can be verified by X-ray diffractiometer (XRD), both of the excitation and emission spectrums of the phosphors can be verified by spectrophotometer (PL). In addition, the surface appearance, cross-sectional structure, and crystal size of the phosphors can be analyzed by scanning electron microscope (SEM), and the luminous intensity can be measured by a digital lux meter.

Depending on the results of this research, thinner phosphor layer combined phosphor powders and binder with 7:3, 1:1, 2:3, and 1:2wt%, we found that the luminous intensity increases with increasing phosphor wt% and increasing input voltage. Moreover, the luminous intensity decreases with increasing the number of phosphor layers and phosphor wt%.

並列關鍵字

Electroluminescence ； ZnS ； BaTiO3 ； Phosphor ； Dielectric material

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