Enhancing efficiency of quantum dot/photoresist nanocomposite using wrinkled silica-quantum dot hybrid particles

Kiju Um, Hyo Jun Kim, Joon Hee Jo, Hyungjoon Jeon, Hye Bin Yang, Young Joo Kim, Kangtaek Lee

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

We have synthesized hybrid particles by embedding CdSe/ZnS quantum dots (QDs) into wrinkled silica nanoparticles. We found that increasing the QD loading decreased the quantum yield (QY) of the wrinkled silica-QD hybrid particles. Compared to the previously-reported silica-QD hybrid particles, the wrinkled silica-QD hybrid particles exhibited higher QY, because the QD surfaces were not chemically modified during the hybridization process. The hybrid particles and free QDs were then used to prepare QD/photoresist nanocomposites. Since photoresist resin contains non-solvent for QDs, nanocomposites containing free QDs showed noteworthy aggregation even at 1.5 wt%, which resulted in deteriorated efficiency and stability. However, we were able to fabricate QD/photoresist nanocomposites successfully using hybrid particles up to 30 wt%, as the wrinkled silica nanoparticles helped in the dispersion of the QDs. By varying the concentration of hybrid particles in the nanocomposites, we found that the hybrid particles at 20 wt% exhibited the highest quantum efficiency. Testing of wrinkled silica/photoresist nanocomposites (without QDs), fabricated with different concentrations of the wrinkled silica nanoparticles, revealed that the highest efficiency at 20 wt% hybrid particles was the result of enhanced scattering by the wrinkled silica nanoparticles. Finally, simple devices in which hybrid particles were placed on blue µ-LEDs were fabricated, and their luminescence properties were analyzed.

Original languageEnglish
Pages (from-to)109-115
Number of pages7
JournalChemical Engineering Journal
Volume369
DOIs
Publication statusPublished - 2019 Aug 1

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

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