Bioinspired ultrathin photonic color convertors for highly efficient micro-light-emitting diodes

FlexMat Pub Date : 2024-09-12 DOI:10.1002/flm2.33
Jiexin Li, Xinrui Ding, Yuzhi Shi, Jiasheng Li, Zihao Deng, Jiayong Qiu, Jinhui Zhang, Wei Luo, Guanwei Liang, Long Zhao, Yong Tang, Ai Qun Liu, Zongtao Li
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Abstract

Pixelated color convertor plays an immensely important role in next-generation display technologies. However, the inherent randomness of light propagation within the convertor presents a formidable challenge to reconcile the huge contradiction between excitation and outcoupling. Here, we demonstrate a bioinspired photonic waveguide pixelated color convertor (BPW-PCC) to realize directional excitation and outcoupling, which is inspired by an insect visual system. The lens array of BPW-PCC enables a focusing photonic waveguide that guides the excitation light and converges it on colloidal quantum dots; the directional channel provides a splitting photonic waveguide to enhance the outcoupling of photoluminescence light. Consequently, the excitation and outcoupling efficiency can be simultaneously improved at this judiciously designed pixelated color convertor with a thickness of 50 μm. By this strategy, ultrathin BPW-PCCs with 4.4-fold enhanced photoluminescence intensity have been demonstrated in micro-light-emitting diode devices and achieved a record-high luminous efficacy of 1600 lm W−1 mm−1, opening a new avenue for efficient miniaturized displays.

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用于高效微型发光二极管的生物启发超薄光子色彩转换器
像素化色彩转换器在下一代显示技术中扮演着极其重要的角色。然而,光在转换器内传播的固有随机性给调和激发和耦合之间的巨大矛盾带来了严峻挑战。在这里,我们展示了一种生物启发光子波导像素化色彩转换器(BPW-PCC),它实现了定向激发和外耦合,其灵感来自昆虫视觉系统。BPW-PCC 的透镜阵列实现了聚焦光子波导,可引导激发光并将其汇聚到胶体量子点上;定向通道提供了分光光子波导,可增强光致发光的外耦合。因此,在这种设计合理、厚度为 50 微米的像素化色彩转换器中,激发和耦合效率可同时得到提高。通过这种策略,超薄 BPW-PCC 的光致发光强度提高了 4.4 倍,并在微型发光二极管器件中实现了 1600 lm W-1 mm-1 的创纪录高光效,为高效微型显示器开辟了一条新途径。
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