AI 中文总结
本研究开发了非注入型电致发光（NI-EL），通过远程电荷储层与非单调渐变壳层量子点，将其激发效率提升超20倍、辐射效率提升7-8倍，性能媲美甚至超越注入型电致发光，为高性能脉冲光源提供了新平台。
AI 中文摘要
无外部电荷注入的电致发光通常具有发射弱、驱动电压过高的特点，原因在于其激发效率和辐射复合效率较低。在此，我们展示了一种颠覆传统认知的非注入型电致发光（NI-EL）。为实现这一目标，我们引入了一种利用远程、态丰富的电荷储层的工作范式，该范式将激发效率提升至接近 unity，较基准提升超过20倍。该策略辅以具有非单调渐变壳层的量子点（QDs），使高场下的辐射效率提升约7-8倍。由此制备的RGB型NI-EL器件均表现出明亮且高效的脉冲发射，关键指标包括：红色器件的开启阈值为3.7 Vrms；绿色器件在光取出增强下，亮度达291628 nits，功率效率为302.6 lm/W；蓝色器件则实现了首个基于QDs的蓝色NI-EL相较于其发光二极管 counterparts 更优异的发射体稳定性。此外，器件的介电损耗极小、响应时间小于100 ns，外部电致发光效率最高达45.4%，进一步强化了机制与性能间的因果关系。这些结果克服了NI-EL固有的机制局限性，确立了可与注入型电致发光（包括交流或直流驱动变体）相媲美或超越的性能，使NI-EL成为高性能脉冲光源的有潜力平台。
英文摘要
Electroluminescence occurring without external charge injection is typically characterized by weak emission and excessive driving voltage, due to low excitation and radiative recombination efficiencies. Here, we demonstrate non-injecting electroluminescence (NI-EL) that challenges this conventional perception. To achieve this, we introduce an operational paradigm that leverages remote, state-abundant charge reservoirs, which elevates the excitation efficiency close to unity - a greater-than-20-fold improvement over the benchmark. This strategy is augmented by quantum dots (QDs) with nonmonotonically graded shells, raising the high-field radiative efficiency by approximately 7-8-fold. The resultant RGB NI-EL devices uniformly exhibit bright and efficient pulsed emissions, with key metrics including: a turn-on threshold of 3.7 Vrms for red; a luminance of 291,628 nits and a power efficiency of 302.6 lm/W for green, with light-outcoupling enhancement; and, for blue, the superior emitter stability of the first QD-based blue NI-EL over its light-emitting diode counterpart. The minimal dielectric loss, sub-100 ns response time, and external EL efficiency of up to 45.4% further reinforce the mechanism-performance causality. These results overcome the inherent mechanistic limitations of NI-EL and establish performance that rivals or surpasses injection-type EL, including AC- or DC-driven variants, positioning NI-EL as a promising platform for high-performance pulsed light sources.
Comments19 pages, 9 figures, 1 table
