What is it about?
The approach for the formulation of suitable inks for inkjet printing based on colloidal CsPbX3 NCs focusing on the importance of the following post-process annealing to ensure that layers are homogeneous at large scale without any detrimental defects like pinholes or propagation of printing errors such as large wrinkles or fractures among grains. As a proof-ofconcept, these layers can directly act as CCL to develop red and green all-inorganic fully inkjet-printed LEDs.
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Why is it important?
We successfully inkjet-printed CsPbBr3 perovskite thin films demonstrating uniform surface and low roughness. The well-known coffee ring issue was solved by selecting the ratio of a high-boiling point solvent dodecane with a low-boiling point solvent hexane. We proved the importance of selecting the post-process annealing comparing three common solutions: hotplate, convection oven and vacuum oven. We verified that vacuum oven it is the most appropriated annealing process by morphological, chemical and optical characterization.
Perspectives
The inkjet-printed CsPbBr3 thin films, with high PLQY, when annealed in vacuum oven at low temperatures, pave the way for their use in lighting and display over illuminated substrates. A prove of this flexibility is their application in the form of back-lighting, which combines blue InGaN chips with the inkjet-printed CsPbBr3 thin films as CCL. These characteristics are promising milestones to improve the definition of current display protocol based on white LED, TFT, and liquid crystal.
Dr. Giovanni Vescio
Universitat de Barcelona
Read the Original
This page is a summary of: High Quality Inkjet Printed‐Emissive Nanocrystalline Perovskite CsPbBr
3
Layers for Color Conversion Layer and LEDs Applications, Advanced Materials Technologies, January 2022, Wiley,
DOI: 10.1002/admt.202101525.
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