Graphene quantum dots (GQDs) have received considerable attention as excellent candidates for promising applications in multifunctional optoelectronic devices. The synthesis method for GQDs has been investigated in an attempt to find an optimal method for fabricating white GQDs (WGQDs) suitable for use in display systems. However, the emission wavelengths of WGQDs are still not sufficient to cover the range of wavelengths required by lighting sources, and the luminance of the light-emitting devices (LEDs) based on the WGQDs is still lower than that of white LEDs (WLEDs) fabricated utilizing organic molecular phosphors. Here, we report high-luminosity WLEDs based on edge functionalized GQDs (EF-GQDs) formed by using a simple solution method. The white light emission of the EF-GQDs originates from the various energy states between the octadecylamine functional group and the graphitic domain. The maximum luminance and the Commission Internationale de l’Enclairage coordinates for the WLEDs based on EF-GQDs are 464 cd/m² and (0.27, 0.29), respectively. The luminosity of 464 cd/m² is, to the best of our knowledge, the highest value ever reported for WLEDs based on GQDs. This successful demonstration of efficiency enhancement for WLEDs based on EF-GQDs can improve our understanding of the mechanisms at play in these devices and lead to their promising applications as backlights in flat panel displays and lighting sources.

石墨烯量子点（GQD）作为多功能光电设备中有希望的应用的优秀候选者已受到相当多的关注。已经研究了用于GQD的合成方法，以寻找用于制造适合在显示系统中使用的白色GQD（WGQD）的最佳方法。然而，WGQD的发射波长仍然不足以覆盖光源所需的波长范围，并且基于WGQD的发光器件（LED）的亮度仍然低于所制造的白色LED（WLED）的亮度。利用有机分子荧光粉。在这里，我们报告基于使用简单解决方案方法形成的边缘功能化GQD（EF-GQDs）的高亮度WLED。EF-GQD的白光发射源自十八烷基胺官能团和石墨域之间的各种能量状态。基于EF-GQD的WLED的最大亮度和国际照明委员会坐标为464 cd / m²和（0.27，0.29）。据我们所知，464 cd / m ²的发光度是有史以来基于GQD的WLED所报告的最高值。基于EF-GQD的WLED效率增强的成功演示可以增进我们对这些设备中起作用机制的理解，并使其有希望在平板显示器和光源中用作背光。