Core Viewpoint - The research team led by Huang Wei from Nanjing University of Technology has achieved a breakthrough in perovskite tandem LED devices, with an external quantum efficiency exceeding 45%, setting a new world record in this field [1]. Group 1: Research Achievements - The team successfully constructed all-perovskite tandem LED devices and proposed an innovative strategy utilizing interlayer photon recycling effects to enhance light extraction efficiency [1]. - The results were published in the international academic journal "Nature" on November 11 [1]. Group 2: Technical Innovations - The research optimized the connection layer structure to achieve efficient charge injection and balance within the tandem devices [1]. - The unique interlayer photon recycling effect allows photons generated by one emitting unit to be reabsorbed and re-emitted by another perovskite layer, surpassing traditional light extraction efficiency limitations, achieving a "1+1>2" effect [1]. Group 3: Industry Implications - The commercial organic LED display screens commonly use tandem device structures, which enhance brightness and lifespan by connecting multiple emitting units [1].

记者12日从南京工业大学获悉，由中国科学院院士、柔性电子全国重点实验室主任黄维领衔的科研团 队，成功构建全钙钛矿叠层发光二极管（LED）器件，并创新性地提出利用层间光子循环效应来提升钙 钛矿LED的光提取效率，使钙钛矿叠层LED的外量子效率突破45%，刷新该领域世界纪录，为开发高性 能钙钛矿LED开辟了全新途径。该成果11日发表于国际学术期刊《自然》。 随着市场对高品质显示和照明需求的不断提升，开发兼具高亮度、低成本及柔性化特征的新型LED技术 已成为世界科技前沿的研究热点。 然而，当前叠层钙钛矿LED的外量子效率仍不足10%，甚至远低于单结器件，严重制约其商业化进程。 此次研究中，团队通过优化连接层结构，实现了叠层器件中高效的电荷注入与平衡。论文共同通讯作 者、柔性电子全国重点实验室教授王建浦介绍："更为重要的是，我们通过调控钙钛矿发光层的微纳结 构，创新性地提出利用叠层器件中独特的层间光子循环效应的策略，即一个发光单元产生的光子可被另 一钙钛矿层重新吸收并再次发射，从而突破了传统光提取效率的限制，实现'1+1>2'的效果。" （文章来源：科技日报） 论文共同通讯作者、南京工业大学柔性电子（未来技术）学院教 ...