設施農業：智慧感測【光電工程研究所/裴靜偉特聘教授】
| 論文篇名 | 英文：Exciton Up-Conversion by Well-Distributed Carbon Quantum Dots in Luminescent Materials for an Efficient Organic Light-Emitting Diode 中文：利用碳量子點的光機子上轉換效應增強有機發光二極體的效率研究 |
| 期刊名稱 | NANOMATERIALS |
| 發表年份,卷數,起迄頁數 | 2022, 12(7), 1174 |
| 作者 | Pei, Zingway(裴靜偉)*; Wei, Han-Yun; Liu, Yi-Chun |
| DOI | 10.3390/nano12071174 |
| 英文摘要 | In this work, we proposed an efficient and straightforward up-conversion process to enhance the external quantum efficiency in a red-emission organic light-emitting diode (OLED). The carbon quantum dots in the luminescent materials initiated the up-conversion by doping the (6,6)-phenyl-C61-butyric acid methyl ester (PCBM) in an amount of 0.001 wt. %, and the external quantum efficiency (EQE) increased from approximately 80% to 9.27% without spectrum change. The time-resolved photoluminescence was applied to understand the mechanism of EQE enhancement in the PCBM-doped OLED. Two decay-time constants fit the TRPL. After PCBM doping, the extended PL intensity indicated increased time constants. The time constants increased from 1.06 and 4.02 ns of the reference sample to 3.48 and 11.29 ns of the PCBM-doped material, respectively. The nonradiative energy transfer (NRET) mechanism was proposed responsible for the decay-time enhancement. The excitons in the PCBM, either by excitation or injection, will transfer to the phosphorescent material nonradiatively. As the PCBM has lower energy levels than the luminous material for electrons, the backward exciton transfer is a kind of up-conversion. With the increased amounts of excitons in the luminescent material, the luminescent external quantum efficiency and the decay-time increased. This up-conversion method is not limited to the red-emission OLED; it could also be applied to blue or green emission. |
| 發表成果與本中心研究主題相關性 | 碳是有機物的基本構成，可以從環境中取得。製成量子點後，可以增強發光二機體的發光效率與強度，具有節能效果，可以應用在仁光光合作用上，對能源永續具有幫助。 |
