Core/shell-structured upconversion nanophosphor and cadmium-free quantum-dot bilayer-based near-infrared photodetectors

A. Ra Hong; Jungyoon Kim; Su Yeon Kim; Seong Il Kim; Kwangyeol Lee; Ho Seong Jang

doi:10.1364/OL.40.004959

Core/shell-structured upconversion nanophosphor and cadmium-free quantum-dot bilayer-based near-infrared photodetectors

A. Ra Hong, Jungyoon Kim, Su Yeon Kim, Seong Il Kim, Kwangyeol Lee, Ho Seong Jang

Department of Chemistry

Research output: Contribution to journal › Article › peer-review

15 Citations (Scopus)

Abstract

The core/shell-structured upconversion nanophosphors (UCNPs) and Cd-free CuInS₂/ZnS quantum dots (QDs) were synthesized via coprecipitation and hot-injection methods, respectively, and they were applied to near infrared (NIR) photodetectors. The β-NaYF₄:Yb;Er/β-NaYF₄ UCNPs emitted intense visible light peaking at 522, 542, and 656 nm via ₂H_11/2, ⁴S_3/2, and ⁴F_9/2 → ⁴I1_5/2 transitions under excitation with 980 nm NIR light. The core/ shell UCNPs showed 6.4 times higher emission intensity than core UCNPs. Charge carriers can be generated from CuInS₂/ZnS QDs in the QD-UCNP mixture due to their broad absorption in the visible spectral region shorter than 600 nm. The photodetector devices were fabricated by spincoating CuInS₂/ZnS QDs on a SiO₂/Si substrate with patterned gold electrodes followed by spin-coating UCNPs on the QD layer. The fabricated QD-UCNP-bilayer-based device showed a drastically increased photocurrent (128 μA) compared with the QD-layer-based device under 980 nm NIR light illumination. Additionally, the fabricated device showed stable ON-OFF switching properties against on and off NIR light.

Original language	English
Pages (from-to)	4959-4962
Number of pages	4
Journal	Optics Letters
Volume	40
Issue number	21
DOIs	https://doi.org/10.1364/OL.40.004959
Publication status	Published - 2015 Nov 1

ASJC Scopus subject areas

Atomic and Molecular Physics, and Optics

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@article{21f3313003f54f41a9a4e7d55c187505,

title = "Core/shell-structured upconversion nanophosphor and cadmium-free quantum-dot bilayer-based near-infrared photodetectors",

abstract = "The core/shell-structured upconversion nanophosphors (UCNPs) and Cd-free CuInS2/ZnS quantum dots (QDs) were synthesized via coprecipitation and hot-injection methods, respectively, and they were applied to near infrared (NIR) photodetectors. The β-NaYF4:Yb;Er/β-NaYF4 UCNPs emitted intense visible light peaking at 522, 542, and 656 nm via 2H11/2, 4S3/2, and 4F9/2 → 4I15/2 transitions under excitation with 980 nm NIR light. The core/ shell UCNPs showed 6.4 times higher emission intensity than core UCNPs. Charge carriers can be generated from CuInS2/ZnS QDs in the QD-UCNP mixture due to their broad absorption in the visible spectral region shorter than 600 nm. The photodetector devices were fabricated by spincoating CuInS2/ZnS QDs on a SiO2/Si substrate with patterned gold electrodes followed by spin-coating UCNPs on the QD layer. The fabricated QD-UCNP-bilayer-based device showed a drastically increased photocurrent (128 μA) compared with the QD-layer-based device under 980 nm NIR light illumination. Additionally, the fabricated device showed stable ON-OFF switching properties against on and off NIR light.",

author = "Hong, {A. Ra} and Jungyoon Kim and Kim, {Su Yeon} and Kim, {Seong Il} and Kwangyeol Lee and Jang, {Ho Seong}",

note = "Publisher Copyright: {\textcopyright} 2015 Optical Society of America.",

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T1 - Core/shell-structured upconversion nanophosphor and cadmium-free quantum-dot bilayer-based near-infrared photodetectors

AU - Hong, A. Ra

AU - Kim, Jungyoon

AU - Kim, Su Yeon

AU - Kim, Seong Il

AU - Lee, Kwangyeol

AU - Jang, Ho Seong

PY - 2015/11/1

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N2 - The core/shell-structured upconversion nanophosphors (UCNPs) and Cd-free CuInS2/ZnS quantum dots (QDs) were synthesized via coprecipitation and hot-injection methods, respectively, and they were applied to near infrared (NIR) photodetectors. The β-NaYF4:Yb;Er/β-NaYF4 UCNPs emitted intense visible light peaking at 522, 542, and 656 nm via 2H11/2, 4S3/2, and 4F9/2 → 4I15/2 transitions under excitation with 980 nm NIR light. The core/ shell UCNPs showed 6.4 times higher emission intensity than core UCNPs. Charge carriers can be generated from CuInS2/ZnS QDs in the QD-UCNP mixture due to their broad absorption in the visible spectral region shorter than 600 nm. The photodetector devices were fabricated by spincoating CuInS2/ZnS QDs on a SiO2/Si substrate with patterned gold electrodes followed by spin-coating UCNPs on the QD layer. The fabricated QD-UCNP-bilayer-based device showed a drastically increased photocurrent (128 μA) compared with the QD-layer-based device under 980 nm NIR light illumination. Additionally, the fabricated device showed stable ON-OFF switching properties against on and off NIR light.

AB - The core/shell-structured upconversion nanophosphors (UCNPs) and Cd-free CuInS2/ZnS quantum dots (QDs) were synthesized via coprecipitation and hot-injection methods, respectively, and they were applied to near infrared (NIR) photodetectors. The β-NaYF4:Yb;Er/β-NaYF4 UCNPs emitted intense visible light peaking at 522, 542, and 656 nm via 2H11/2, 4S3/2, and 4F9/2 → 4I15/2 transitions under excitation with 980 nm NIR light. The core/ shell UCNPs showed 6.4 times higher emission intensity than core UCNPs. Charge carriers can be generated from CuInS2/ZnS QDs in the QD-UCNP mixture due to their broad absorption in the visible spectral region shorter than 600 nm. The photodetector devices were fabricated by spincoating CuInS2/ZnS QDs on a SiO2/Si substrate with patterned gold electrodes followed by spin-coating UCNPs on the QD layer. The fabricated QD-UCNP-bilayer-based device showed a drastically increased photocurrent (128 μA) compared with the QD-layer-based device under 980 nm NIR light illumination. Additionally, the fabricated device showed stable ON-OFF switching properties against on and off NIR light.

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Core/shell-structured upconversion nanophosphor and cadmium-free quantum-dot bilayer-based near-infrared photodetectors

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