Light conversion-efficiency (LCE) remains key challenge for application of quantum dots (QDs) converted light-emitting diodes (QCLEDs) due to fluorescence quenching of concentrated QDs. Here, we developed an optical scatterer made of assembled 0D SiO₂ nanospheres and 2D BN nanoplates and studied their mechanisms to improve the LCE of QCLEDs. Experiment and finite-difference time-domain (FDTD) analysis reveal the 0D–2D hybrid structure integrates the optical characteristics of the forward-scattering from the 0D SiO₂ sphere and backward-scattering of blue light from the 2D BN plate. The resulting 0D–2D hybrid scatterers at the appropriate SiO₂/BN ratio balance the backward- and forward-scattered light and, hence, maximize the excitation light absorption and the light extraction of QCLEDs at low QD concentration. We demonstrated that the LCE of the QCLEDs with SiO₂–BN scatterers is increased by 99%, 13%, and 27% as compared to the QCLEDs without scatterers and with individual 0D SiO₂ and 2D BN scatterers, respectively. The hybrid scatterers also show extra economic value by saving up to 75% of QDs in QCLEDs at the same light output.

中文翻译：

---

0D–2D混合散射体提高了量子点转换LED的效率

由于浓缩QD的荧光猝灭，光转换效率（LCE）仍然是应用量子点（QD）转换的发光二极管（QCLED）的关键挑战。在这里，我们开发了由组装的0D SiO ₂纳米球和2D BN纳米板制成的光散射体，并研究了它们改善QCLED的LCE的机理。实验和有限差分时域（FDTD）分析表明，0D–2D混合结构整合了0D SiO ₂球的正向散射和2D BN板的蓝光的反向散射的光学特性。在适当的SiO _2下产生的0D–2D混合散射体/ BN比可平衡后向散射光和前向散射光，因此可在低QD浓度时最大化QCLED的激发光吸收和光提取。我们证明，与不带散射体和单独的0D SiO ₂和2D BN散射体的QCLED相比，带SiO ₂ -BN散射体的QCLED的LCE分别提高了99％，13％和27％。通过在相同的光输出下节省多达75％的QCLED中的QD，混合型散射体还显示出额外的经济价值。