Near-complete photoluminescence retention and improved stability of InP quantum dots after silica embedding for their application to on-chip-packaged light-emitting diodes
- Authors
- Jang, Eun-Pyo; Jo, Jung-Ho; Kim, Min-Seok; Yoon, Suk-Young; Lim, Seung-Won; Kim, Jiwan; Yang, Heesun
- Issue Date
- 2018
- Publisher
- ROYAL SOC CHEMISTRY
- Citation
- RSC ADVANCES, v.8, no.18, pp.10057 - 10063
- Journal Title
- RSC ADVANCES
- Volume
- 8
- Number
- 18
- Start Page
- 10057
- End Page
- 10063
- URI
- https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/4809
- DOI
- 10.1039/c8ra00119g
- ISSN
- 2046-2069
- Abstract
- Silica is the most commonly used oxide encapsulant for passivating fluorescent quantum dots (QDs) against degradable conditions. Such a silica encapsulation has been conventionally implemented via a St <spacing diaeresis> ober or reverse microemulsion process, mostly targeting CdSe-based QDs to date. However, both routes encounter a critical issue of considerable loss in photoluminescence (PL) quantum yield (QY) compared to pristine QDs after silica growth. In this work, we explore the embedment of multishelled InP/ZnSeS/ ZnS QDs, whose stability is quite inferior to CdSe counterparts, in a silica matrix by means of a tetramethyl orthosilicate-based, waterless, catalyst-free synthesis. It is revealed that the original QY (80%) of QDs is nearly completely retained in the course of the present silica embedding reaction. The resulting QD-silica composites are then placed in degradable conditions such UV irradiation, high temperature/high humidity, and operation of an on-chip-packaged light-emitting diode (LED) to attest to the efficacy of silica passivation on QD stability. Particularly, the promising results with regard to device efficiency and stability of the on-chip-packaged QD-LED firmly suggest the effectiveness of the present silica embedding strategy in not only maximally retaining QY of QDs but effectively passivating QDs, paving the way for the realization of a highly efficient, robust QD-LED platform.
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Collections - Graduate School > Materials Science and Engineering > 1. Journal Articles
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