Speckle-free laser display enabled by self-assembled supraparticles of semiconductor nanoplatelets  

作　　者：Chenlin Wang Haixiao Zhao Xian Zhao Baoqing Sun Yuan Gao 

机构地区：[1]School of Information Science and Engineering,Shandong University,Qingdao 266237,China [2]Key Laboratory of Laser&Infrared System(Shandong University),Ministry of Education,Shandong University,Qingdao 266237,China [3]Center for Optics Research and Engineering(CORE),Shandong University,Qingdao 266237,China

出　　处：《Nano Research》2025年第2期769-775,共7页纳米研究(英文版)

基　　金：This work was financially supported by the National Natural Science Foundation of China(No.62205180);the Natural Science Foundation of Shandong Province(No.ZR2022QF029);the Taishan Scholar Program of Shandong Province(Young Scientist).

摘　　要：Laser-based light sources are highly desirable for display applications due to their narrow emission linewidth and exceptional brightness.However,the coherence inherent in lasers often leads to the formation of unwanted speckles,which can significantly degrade display quality.Thus,there is a critical need for light sources that retain the narrow emission and high brightness of lasers while minimizing spatial coherence to reduce speckle formation.Random lasing has emerged as a promising strategy to address this issue,though its random emission directions can lead to energy losses.To overcome this challenge,we propose a novel approach in which CdSe nanoplatelets,known for their efficient optical gain properties,are self-assembled into supraparticles(SPs),serving as both scattering centers and gain media.This configuration enables random lasing,and by coupling the random gain medium to a Fabry-Perot(FP)cavity,we successfully direct the typically omnidirectional random lasing into a controlled,low-coherence emission.Our experimental results,comparing conventional lasers(e.g.,He:Ne lasers)with our SP-based laser for a projector,demonstrate effective suppression of speckle formation,reducing speckle contrast from 0.5 to 0.05.These findings offer a promising solution for improving the performance and quality of laser-based displays.

关 键 词：CDSE nanoplatelet SELF-ASSEMBLY cavity coupled random lasing speckle-free display 

分 类 号：TN2[电子电信—物理电子学]