電激發光元件之發光特性與衰減研究

The Luminescence Characteristics and Decay in Electroluminescence Devices

曾馨葶(Hsin-Ting Tseng)

指導教授 ： 唐自標

國立臺北科技大學/工程學院/材料及資源工程系研究所/碩士(2012年)

https://doi.org/10.6841/NTUT.2012.00354

摘要

使用電激發光（Electroluminescence,EL）擁有特定光源卻不會發熱，具備重量輕、厚度薄、耗電量低等優點，操作溫度低、可撓性、可製作大尺寸，製程簡單、操作電壓低、低成本。對於環境資源的消耗，也相對較少。目前電激發光元件的結構，大都以厚膜印刷技術達成，因此具有均勻光源。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。
本實驗採用不同螢光粉及粘著劑間的配比，製作不同發光層烘烤溫度的電激發光元件，探討其發光及衰減特性，以尋求生產製造成本低、發光效果不錯之電激發光元件，利用X-光粉末繞射儀(XRD)鑑定樣品之晶體結構，以光激發光光譜儀(PL)分析螢光粉之激發光譜及放射光譜，以掃瞄式電子顯微鏡(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2:3及1:2配比(重量比)製作之發光元件相對發光強度，在固定電壓和烘烤溫度下，螢光粉所佔之配比愈高之發光元件其發光強度亦愈高，不同烘烤溫度下，亮度並不會有太多差距。
經過長時間的連續發光後測量其相對發光強度，螢光粉與粘結劑以1:2配比比以2:3的衰減比例較高，以較高溫烘烤出的螢光層製作出的發光元件，也比較低溫烘烤出的螢光層製作出的發光元件，衰減比例較高。

關鍵字

電激發光 ； 螢光粉 ； 硫化鋅 ； 壽命 ； 鈦酸鋇

並列摘要

The electroluminescences device has the advantage of light weight, thin thickness, low power consumption, low operation temperature, and available to curve or making to large size. It is also with simple process, low operation voltage and cost, consumption of environment resource. Currently, the device of electroluminescence is making by thickness film printing technology, cause uniform light source. Usually, the electroluminescence is 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 composing of phosphor powders and binder with wt% to make different backing phosphor layer, and analyze the influence of luminous and decay, to find out low cost and high efficiency. The crystal structure of the phosphors can be verified by X-ray diffractiometer (XRD), 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, phosphor layer combined phosphor powders and binder with 2:3, and 1:2wt%, we found that the luminous intensity increases no clear different luminous intensity with different backing temperature of phosphor layer.
Measurement of relative luminous intensity after a long period of continuous light-emittung, the ratio of phosphor powder and bider is 1:2 show higher decay rate, the fluorescent layer bacing with higher temperature produce light emitting devices, show higher decay rate.

並列關鍵字

EL ； ZnS ； decay ； Phosphor ； Dielectric material

參考文獻

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