In:
Journal of Materials Chemistry C, Royal Society of Chemistry (RSC), Vol. 10, No. 29 ( 2022), p. 10708-10718
Abstract:
Printed quantum dot (QD) light emitting diodes (QLEDs) over a large scale have received much interest in the last decade owing to the demand for the next generation of self-emissive large-area displays. To realize printing technology for QLEDs, a pioneering study suggested using a co-solvent system or a polymer additive in CdSe-based QLEDs. However, limitations on printed QLEDs with eco-friendly QDs, including the selection of ink solvent, environmental degradation of QDs in the air by temperature and O 2 /H 2 O level, and viscosity, make it difficult to achieve higher luminescence and external quantum efficiency (EQE) than that of ionic-bonded Cd-based QDs. Herein, we design an air-processable and stable ink with a photoinitiator (PI) mediating cross-linkage between eco-friendly QDs for inkjet-printed QLEDs. Once QD inks with a PI are deposited on the desired surface, their film polymerizes in situ through radical formation induced by ultraviolet (UV) exposure. Cross-linking reactions between ligands in the QDs reduce the distances between them, leading to flattening of the surface and enhancement of environmental stability in air. Printed InP-based green QLEDs demonstrated maximum luminescence values of 3600 cd m −2 at 10 V on ITO/glass for the very first time. Finally, large-scale InP red/green/blue QLEDs directly printed with a bird image were fabricated on the flexible substrate.
Type of Medium:
Online Resource
ISSN:
2050-7526
,
2050-7534
Language:
English
Publisher:
Royal Society of Chemistry (RSC)
Publication Date:
2022
detail.hit.zdb_id:
2702245-6
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