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Materials 2017, 10(11), 1242; doi:10.3390/ma10111242

Synthesis of Quantum Dot-ZnS Nanosheet Inorganic Assembly with Low Thermal Fluorescent Quenching for LED Application

1
Tianjin Key Laboratory of Electronic Materials and Devices, School of Electronics and Information Engineering, Hebei University of Technology, 5340 Xiping Road, Beichen District, Tianjin 300401, China
2
SHINEON Co., LTD., Building 3, No. 58 Jinghai Road, BDA, Beijing 100176, China
*
Authors to whom correspondence should be addressed.
Received: 30 September 2017 / Revised: 17 October 2017 / Accepted: 23 October 2017 / Published: 27 October 2017
(This article belongs to the Section Advanced Composites)
View Full-Text   |   Download PDF [4605 KB, uploaded 28 October 2017]   |  

Abstract

In this report, to tackle the thermal fluorescent quenching issue of II-VI semiconductor quantum dots (QDs), which hinders their on-chip packaging application to light-emitting diodes (LEDs), a QD-ZnS nanosheet inorganic assembly monolith (QD-ZnS NIAM) is developed through chemisorption of QDs on the surface of two-dimensional (2D) ZnS nanosheets and subsequent assembly of the nanosheets into a compact inorganic monolith. The QD-ZnS NIAM could reduce the thermal fluorescent quenching of QDs effectively, possibly due to fewer thermally induced permanent trap states and decreased Förster resonance energy transfer (FRET) among QDs when compared with those in a reference QD composite thin film. We have demonstrated that the QD-ZnS NIAM enables QDs to be directly packaged on-chip in LEDs with over 90% of their initial luminance being retained at above 85 °C, showing advantage in LED application in comparison with conventional QD composite film. View Full-Text
Keywords: quantum dots; nanosheet; assembly; thermal stability quantum dots; nanosheet; assembly; thermal stability
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Xie, Y.; Geng, C.; Gao, Y.; Liu, J.G.; Zhang, Z.-H.; Zhang, Y.; Xu, S.; Bi, W. Synthesis of Quantum Dot-ZnS Nanosheet Inorganic Assembly with Low Thermal Fluorescent Quenching for LED Application. Materials 2017, 10, 1242.

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