In-situ solid-phase anion-exchange full-color perovskite light-emitting devices  

作　　者：Danyang Li Junjie Wang Jian Wang Junbiao Peng 

机构地区：[1]Institute of Polymer Optoelectronic Materials and Devices,State Key Laboratory of Luminescent Materials and Devices,South China University of Technology,Guangzhou 510640,China

出　　处：《Science China Chemistry》2023年第6期1707-1713,共7页中国科学（化学英文版）

基　　金：supported by Key R&D Plan of Guangdong Province(2022B0303010001);the National Natural Science Foundation of China(52073104)。

摘　　要：Perovskite materials can realize the transition from green light to full-visible light spectrum by halogen anion exchange.Here,we designed an in-situ solid-phase anion-exchange method combined with inkjet printing to achieve full-color perovskite quantum dot light-emitting diodes(PeQD-LEDs).It was revealed that,in addition to the concentration,the anion-exchange rate was affected by the dielectric constant of the anion-exchange medium solvent.Without destroying the PeQD film,the higher the dielectric constant of the solvent,the faster the reaction rate.And at the same time,the solvent with higher dielectric constant will cause more defects,so the morphology,structure and properties of the perovskite films varied with solvents.The chain length of amine salts in anion-exchange medium solute also played a key role in the stability of electroluminescence spectra.The obtained blue-light devices had a maximum EQE of 4.6%at 481 nm and 6.6%at 493 nm prepared by spin-coating.For inkjet printing,instead of printing red-,green-and blue-luminescent materials,we printed halogen-containing materials to achieve the in-situ solid-phase anion-exchange with underlying Pe QDs,and the inkjet-printed full-color device showed the current efficiency of 0.78 cd A^(-1).The method to achieve full-color devices by inkjet-printing halogen-containing materials can not only simplify the process,but also broaden the range of material selection,making the ink preparation more selective.

关 键 词：perovskite light-emitting diode inkjet print anion exchange full color 

分 类 号：TB34[一般工业技术—材料科学与工程]