高效率雙金屬反射鏡強耦合有機發光二極體之研究;Hight efficient strongly coupled organic light-emitting based on double metal mirror

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题名:	高效率雙金屬反射鏡強耦合有機發光二極體之研究;Hight efficient strongly coupled organic light-emitting based on double metal mirror
作者:	黃彥融;Huang, Yan-Rong
贡献者:	光電科學與工程學系
关键词:	偏極子;強耦合;熱延遲螢光;Polariton;Strong coupling;TADF
日期:	2021-01-28
上传时间:	2021-03-18 17:05:49 (UTC+8)
出版者:	國立中央大學
摘要:	本論文主旨為研究在intra-cavity pumping架構下以橘光熱延遲螢光(Thermally Activated Delayed Fluorescence,TADF)有機發光二極體(OLED)為光子源的電激發有機偏極子元件。intra-cavity pumping以直接激發偏極子能態的方式放光，在選擇材料上可以將高吸收層與發光層分開，其中高吸收層與OLED之間有一空間層隔開，使電流不會與OLED以外的膜層互相影響。四種不同厚度下反射鏡的強耦合元件，在模擬上皆讓電場於高吸收層和發光層為峰值，以此對強耦合元件進行優化，同時與弱耦合元件比較，發現反射鏡的反射率對元件耦合與效率有極大的影響，太低的反射率會使元件的發光模態趨近光子模態而非設計的下支能態，從反射鏡的變化我們做出效率高且能態符合設計的強耦合元件。本論文有機偏極子元件以DEDOC作為高吸收強耦合材料與TXO-TPA橘光OLED作為光子源，我們以生命週期(lifetime)較長、效率較高的熱延遲螢光材料，實驗證明效率較高的OLED對元件的效率有相當明顯的影響，在優化元件後強耦合元件有190 meV的拉比分裂及5 %的外部量子效率，為目前電激發有機偏極子元件最高的發光效率。此一結果有助於未來高效率電激發有機偏極子元件在材料選擇上有更大的發揮空間之依據，進一步提供電激發偏極子雷射發展的基礎。 ;In this thesis, an electrically pumped organic polariton device embedded with an orange thermally activated delayed fluorescence (TADF) organic light-emitting diode (OLED) as a photon source based on an intra-cavity pumping is studied. Intra-cavity pumping illuminates by directly pumping the energy states of the polarons. The high absorption layer can be separated from the illuminating layer by the selection of materials. There is a layer between the high absorption layer and the OLED, such that the current will not influence other layers except for the OLED. In a simulation, the strong coupling devices of the reflectors with four different kinds of thicknesses make the electric field peak in the high absorption layer and the light-emitting layer. It optimizes the strong coupling devices. Simultaneously, compared with the weak coupling devices, the reflectivity of the reflector is found that it has a great impact on the coupling and efficiency of the devices. A reflectivity that is too low will make the device′s illuminating mode approach the photon mode instead of the designed lower polariton. According to the reflectors′ change, the strong coupling device with high efficiency and the energy state meeting with the design is made. In this thesis, the organic polarizer device uses the DEDOC as the high absorption and strong coupling material and uses the TXO-TPA orange OLED as the photon source. The TADF materials with a longer lifetime and higher efficiency show that the OLEDs with higher efficiency significantly impact the device′s efficiency. After optimizing the device, the strong coupling device has a rabi-splitting of 180 meV and 5% external quantum efficiency. They are currently the highest luminous efficiency of electrically pumped organic polarizer devices. This result will help the electrically pumped organic polaron devices with high-efficiency have a much greater benefit for selecting the materials in the future, thereby providing the basis for the development of electrically pumped polaron lasers.
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