The development of white light-emitting LED (WLED) is now one of the important demands of present society due to its energy saving feature. However, in this work, an ingenious strategy has been employed to develop Forster resonance energy transfer (FRET) based and rare-earth material free luminescent duo (LD) for the generation of white light. A colloidal LD, consisting of nitrogen-doped graphene quantum dots (N-GQDs) and DCM dye (DCM@N-GQDs), is employed for demonstrating the FRET. The band-gap is engineered by nitrogen (N) doping in GQDs, and an energy transfer efficiency of ~30% for white light generation is attained. The widely tunable PL emission from blue to the red region has been obtained by changing the D-A ratio. Therefore, the present work has provided an alternate approach to widen the light emission band of a conventional laser dye, which is otherwise restricted within a limited region of the visible spectrum. FRET-based WLED (F-WLEDs) with colour rendering index of 70 and correlated colour temperature of 4690 K have also been fabricated. The F-WLED exhibits an emission overlapping of 56% with the solar spectrum (AM 1.5) in visible region, which is doubled in compared to that of a commercial WLED. The present report of rapid synthesis of highly luminescent N doped GQDs and the strategy used here for generation of FRET based colloidal DCM-GQDs luminescent duo may also be extended further with other suitable laser dyes for further widening as well as tuning the spectral range of light emissions of different commercially available laser dyes and GQDs for their different photonic applications.

中文翻译：

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在胶体石墨烯量子点染料系统中，Forster共振能量转移有助于白光的产生和发光调谐。

白光LED（WLED）由于其节能特性而成为当今社会的重要需求之一。但是，在这项工作中，采用了一种巧妙的策略来开发基于Forster共振能量转移（FRET）的和无稀土材料的发光二重体（LD）以产生白光。由氮掺杂石墨烯量子点（N-GQDs）和DCM染料（DCM @ N-GQDs）组成的胶体LD用于演示FRET。带隙是通过在GQD中掺杂氮（N）来设计的，实现了白光产生的能量转移效率约为30％。通过更改DA比率，可以实现从蓝色到红色区域的可调PL发射。因此，本工作提供了另一种方法来加宽传统激光染料的发光带，否则限制在可见光谱的有限区域内。还制造了显色指数为70，相关色温为4690 K的基于FRET的WLED（F-WLED）。F-WLED在可见光区域的发射光谱与太阳光谱（AM 1.5）重叠56％，是商用WLED的两倍。快速合成高发光N掺杂GQD的本报告以及此处用于生成基于FRET的胶体DCM-GQDs发光二重奏的策略也可以与其他合适的激光染料进一步扩展，以进一步加宽并调整光的光谱范围发射用于其不同光子应用的不同商业激光染料和GQD。还制造了显色指数为70，相关色温为4690 K的基于FRET的WLED（F-WLED）。F-WLED在可见光区域的发射光谱与太阳光谱（AM 1.5）重叠56％，是商用WLED的两倍。快速合成高发光氮掺杂GQD的本报告以及此处用于生成基于FRET的胶体DCM-GQDs发光二重奏的策略也可以与其他合适的激光染料进一步扩展，以进一步加宽并调整光的光谱范围发射用于其不同光子应用的不同商业激光染料和GQD。还制造了显色指数为70，相关色温为4690 K的基于FRET的WLED（F-WLED）。F-WLED在可见光区域的发射光谱与太阳光谱（AM 1.5）重叠56％，是商用WLED的两倍。快速合成高发光N掺杂GQD的本报告以及此处用于生成基于FRET的胶体DCM-GQDs发光二重奏的策略也可以与其他合适的激光染料进一步扩展，以进一步加宽并调整光的光谱范围发射用于其不同光子应用的不同商业激光染料和GQD。F-WLED在可见光区域的发射光谱与太阳光谱（AM 1.5）重叠56％，是商用WLED的两倍。快速合成高发光氮掺杂GQD的本报告以及此处用于生成基于FRET的胶体DCM-GQDs发光二重奏的策略也可以与其他合适的激光染料进一步扩展，以进一步加宽并调整光的光谱范围发射用于其不同光子应用的不同商业激光染料和GQD。F-WLED在可见光区域的发射光谱与太阳光谱（AM 1.5）重叠56％，是商用WLED的两倍。快速合成高发光氮掺杂GQD的本报告以及此处用于生成基于FRET的胶体DCM-GQDs发光二重奏的策略也可以与其他合适的激光染料进一步扩展，以进一步加宽并调整光的光谱范围发射用于其不同光子应用的不同商业激光染料和GQD。