- 學位論文
有機發光二極體在變溫下的電流電壓特徵曲線與發光頻譜之變化
Current-Voltage Characteristics and Luminescence Spectrum of Organic Light Emitting Devices at Different Temperature
摘要
本論文主要研究在不同溫度下有機發光二極體之光譜變化。首先，我們調控元件摻雜濃度，觀察在不同濃度下元件的電流密度、亮度、效率以及光譜表現的趨勢；有機元件分為兩類：紅色螢光元件與藍色磷光元件，由摻雜濃度變化以及元件的特徵曲線觀察激子複合機制、能量轉移機制、發光機制等元件之特性，而不同元件下，不同機制對於溫度變化之敏感度各不相同。 由於螢光與磷光摻雜元件之能量轉移機制與發光機制完全不同，因此兩者元件在變溫下造成光譜改變的趨勢以及敏感度大不相同。在螢光元件中，不同濃度下必須考慮主、客發光體之吸收與放光效率以及能量轉移效率在變溫下所造成的影響；而在磷光元件中，因摻雜濃度較高，能量轉移機制於元件中效用不大，因此變溫下光譜變化並不明顯。
並列摘要
In this thesis, organic light emitted diode (OLED) is investigated the difference of spectrum at different temperature. First, we change the devices’ doping concentration, observing the tendency of OLED’s current density, luminance, efficiency and spectrum with doping concentration variation. Our organic device has two categories: red fluorescent device and blue phosphorescent device. By way of the relationship between device’s doping concentration and the slopes of J-V double log plot, we can predict the characteristic of these types of organic device, like exciton recombination mechanism, energy transfer mechanism and radiation process. General speaking, different types of organic device has different sensitivity of temperature because of their distinct radiation mechanism. In fluorescent devices, it is considered that the absorption and radiation efficiency of host and dopant material and energy transfer efficiency will be affected at different temperature. In phosphorescent devices, which doping concentration is much higher than fluorescent devices, the variation of luminescence spectrum is unobvious at different temperature.
參考文獻
延伸閱讀
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- 戴士傑（2013）。有機發光二極體用於照明之 頻譜設計與評價〔碩士論文，國立中正大學〕。華藝線上圖書館。https://www.airitilibrary.com/Article/Detail?DocID=U0033-2110201613550969
- 王璽清（2010）。色溫可調變有機發光二極體之研製〔碩士論文，國立清華大學〕。華藝線上圖書館。https://www.airitilibrary.com/Article/Detail?DocID=U0016-1901201111404517
- Nien, S. Y. (2008). Optical and Electrical Characteristics of Organic Light Emitting Devices [master's thesis, National Taiwan University]. Airiti Library. https://doi.org/10.6342/NTU.2008.03217