如何提高有机发光二极管(OLED)的功率效率是其市场化应用面临的关键问题之一。贵金属纳米粒子和磁性纳米粒子掺杂到OLED发光层中都可以提高功率效率，前者是通过金属纳米粒子表面激发产生的局域表面等离子体共振效应同发射能量耦合实现，后者是由于磁性纳米粒子可以加速反极性电荷载体重组，使磁性掺杂OLED的功率效率更高。本项目基于铂基双核金属聚合物经高温可控分解后生成表面碳包覆的铂基磁性合金纳米粒子（如FePt@C，CoPt@C，NiPt@C等），其中包覆层可防止激子在金属纳米颗粒表面发生淬灭，而合金纳米粒子同时具有磁效应和表面等离子体效应，将其掺杂进OLED器件发光层中，利用两者协同作用有望更有效的提高功率效率。本工作致力于研究磁性合金纳米粒子及其尺寸、掺杂浓度在OLED器件中的影响机制，并通过理论计算建立掺杂改性前后材料界面性能变化与OLED功率效率的关系模型，使得本项目具有学术和应用双重价值。

High power efficiency is one of the key technical challenges organic light-emitting diode (OLED) faces for commercialization. Incorporation of noble metal nanoparticles (NPs) or magnetic NPs into the active organic emissive layer can help to boost the power efficiency. This is achieved through the coupling of the localized surface plasmon resonance (LSPR), formed on the surface of metal NPs, with the electroluminescence within the OLED. The use of magnetic NPs is favorable for the efficient operation of OLED through effective combination of opposite charge carriers in the emissive layer. However, the presence of metal NPs and magnetic NPs can also induce exciton quenching. In this project, we intend to study the high efficiency OLEDs using carbon-coated core/shell NPs (i.e. FePt@C, CoPt@C, NiPt@C). The carbon-coated core/shell NPs, synthesized by pyrolysis of bimetallopolymer, possess both LSPR and magnetic effects, and also enable to prevent exciton quenching. The aim of the work is to realize high efficiency OLED by optimizing NP doping into the active emissive layer. We will design and also synthesize different carbon-coated core-shelled NPs that can be solution-processed for application in OLEDs, understand the effects of sizes and concentration of NPs on exciton quenching in OLEDs, optimize the core-shell NP structures and study the performance enhancement of NP-doped OLEDs compared to a conventional control OLED through theoretical simulation and experimental optimization.