Directional emissions from perovskite nanocrystals thin film enabled by metasurface integration through one step spin-coating process  

作　　者：Kexue Li Xuanyu Zhang Peinan Ni Juncheng Liu Fengyuan Lin Xu Man Wenfeng Cai Jianxun Liu Yanjun Liu Rui Chen Zhipeng Wei 

机构地区：[1]State Key Laboratory of High Power Semiconductor Laser,School of physics,Changchun University of Science and Technology,Changchun 130022,China [2]Department of Electrical and Electronic Engineering,Southern University of Science and Technology,Shenzhen 518055,China [3]Photonics Laboratory,Department of Microtechnology and Nanoscience,Chalmers University of Technology,Göteborg,SE-41296,Sweden

出　　处：《Nano Research》2023年第5期7646-7653,共8页纳米研究（英文版）

基　　金：the National Natural Science Foundation of China(Nos.11804335,61904017,12074045,and 62174079);Science,Technology and Innovation Commission of Shenzhen Municipality(Projects Nos.JCYJ20210324120204011 and KQTD2015071710313656);P.N.N.acknowledges the support of H2020 Research and Innovation Program(Marie Skłodowska-Curie Individual Fellowship;Agreement No.101027383).

摘　　要：Advances in thin film light-emitting devices have fueled the rapid growth of a new class of solid-state lighting devices,featuring low fabrication cost,high quantum efficiency,broadband spectrum coverage,etc.In contrast to the conventional inorganic semiconductors that rely on lattice matched high crystalline quality substrate,solution processable thin films eliminate the dependence on the substrate,which is highly desired for the ease and versatility of integrations with foreign medium.By taking this advantage,this work developed an ultracompact solution to control the directionality of thin film emitters using integrated dielectric metasurface through one step spin-coating process.As a proof of concept,directional emissions from perovskite nanocrystal thin film,including collimated light emissions and two-dimensional beam steering,are experimentally demonstrated.Notably,our approach,where light emitters were integrated on the back side of substrate after the fabrication of metasurface,judiciously avoids any potential degradation of material optical quality caused by the multi-step nanofabrication.Therefore,it can serve as a generalized scheme to engage the advantageous properties of dielectric metasurface,including the compactness,high efficiency,beam controllability with the emerging thin film light-emitting diodes(LEDs),which is applicable to a wide range of solution processable materials,including organic light-emitting diodes,quantum-dot light emitting diodes,polymer LEDs,and perovskite LEDs,opening up new pathways to develop low-cost and ultra-compact solid state light sources with versatile beams characteristics.

关 键 词：solid state light source perovskite light-emitting diodes(LEDs) metasurface integrations on-chip beam shaping beam steering 

分 类 号：TB383[一般工业技术—材料科学与工程]