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Copper-based Perovskites with Horizontal Transition Dipole Moment for Highly Efficient Light-emitting Diodes

具有水平跃迁偶极矩的铜基钙钛矿用于高效发光二极管

基本信息

批准号：
EP/X025764/1
负责人：
Samuel Stranks
金额：
$ 19.5万
依托单位：
University of Cambridge
依托单位国家：
英国
项目类别：
Fellowship
财政年份：
2022
资助国家：
英国
起止时间：
2022 至无数据
项目状态：
未结题

来源：
https://gtr.ukri.org/projects?ref=EP%2FX025764%2F1
关键词：
Copper based Perovskites Horizontal Transition

项目摘要

Halide perovskites are poised to revolutionize the LEDs display technology for their extraordinary optoelectronic properties, such ashigh colour purity, easy solution processibility, nearly 100% photoluminescence quantum yield (PLQY), and broad light emissiontunability. However, to realize the practical applications of perovskite LEDs in display and lighting technology, some key issues, suchas the presence of toxic lead in most emissive perovskites and the weak stability of typical perovskite LEDs, must be solved. Copper-basedperovskites, especially the blue emissive Cs3Cu2I5, are one of the most promising lead-free perovskite families for their lowtoxicity, remarkable PLQY, and excellent stability. Nevertheless, the record external quantum efficiency (EQE) of Cs3Cu2I5 blue LEDs isonly 1.12%. In this proposal, we will improve the light outcoupling efficiency of copper-based perovskite LEDs by controlling thetransition dipole moment orientation of the emissive layers. Copper-based perovskite thin films with dominated horizontal transitiondipole moments will be fabricated by synthesizing their ultrathin nanoplates and assembling these nanoplates into thin films.Copper-based perovskite LEDs with these thin films as emissive layers will be manufactured and theoretically investigated with thefinite-difference time-domain (FDTD) method. By doing so, we aim to break the record for the EQE of copper-based perovskite LEDswith an EQE surpassing 10% in blue LEDs and surpassing 4% in white LEDs.

卤化物钙钛矿以其优异的光电性能，如高色纯度、易溶液加工性、近100%的光致发光量子产率（PLQY）和宽光发射调谐性，有望彻底改变LED显示技术。然而，要实现钙钛矿LED在显示和照明技术中的实际应用，还必须解决一些关键问题，如大多数钙钛矿发光材料中存在有毒的铅，以及典型钙钛矿LED稳定性差等。铜基钙钛矿，尤其是蓝色发光的Cs_3Cu_2I_5，具有低毒性、高的PLQY和优异的稳定性，是最有前途的无铅钙钛矿家族之一。然而，Cs3Cu2I5蓝光LED的最高外量子效率（EQE）仅为1.12%。在这个方案中，我们将通过控制发光层的跃迁偶极矩取向来提高铜基钙钛矿LED的光输出耦合效率。通过合成超薄纳米片并将这些纳米片组装成薄膜，制备出具有主导水平跃迁偶极矩的铜基钙钛矿薄膜，并以这些薄膜为发射层制备出铜基钙钛矿LED，并采用时域有限差分法（FDTD）进行理论研究。通过这样做，我们的目标是打破铜基钙钛矿LED的EQE记录，蓝色LED的EQE超过10%，白色LED的EQE超过4%。