Improvement of thermal stability of type-II composition-gradient thick-shell quantum dots green light-emitting diodes

Hsin-Chieh Yu; Hoang Tuan Vu

doi:10.1117/12.2252401

Improvement of thermal stability of type-II composition-gradient thick-shell quantum dots green light-emitting diodes

Hsin-Chieh Yu^*, Hoang Tuan Vu

^*Corresponding author for this work

Institute of Lighting and Energy Photonics

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Abstract

Improvement of thermal stability of green quantum dot light emitting diodes (QD-LEDs) was demonstrated by using composition-gradient thick-shell CdSe@ZnS/ZnS quantum dots (QDs). The electroluminescence intensity only decreased 3% even when the operation temperature was elevated to 110 °C. The current efficiency roll-off effect was improved nearly 200% under higher current density. Thick-shell QDs with low defective structure could effectively prevent the electron-hole pairs from nonradiative Auger recombination and avoid the thermal-stress-induced expansion at higher temperatures and driving current. The maximum current efficiency of the thick-shell-device is 10.3 cd/A, which is much higher than 1.57 cd/A for the conventional thin-shell-device.

Original language	English
Title of host publication	Light-Emitting Diodes
Subtitle of host publication	Materials, Devices, and Applications for Solid State Lighting XXI
Editors	Michael R. Krames, Jong Kyu Kim, Li-Wei Tu, Martin Strassburg
Publisher	SPIE
ISBN (Electronic)	9781510606890
DOIs	https://doi.org/10.1117/12.2252401
State	Published - 1 Jan 2017
Event	Light-Emitting Diodes: Materials, Devices, and Applications for Solid State Lighting XXI 2017 - San Francisco, United States Duration: 30 Jan 2017 → 1 Feb 2017

Publication series

Name	Proceedings of SPIE - The International Society for Optical Engineering
Volume	10124
ISSN (Print)	0277-786X
ISSN (Electronic)	1996-756X

Conference

Conference	Light-Emitting Diodes: Materials, Devices, and Applications for Solid State Lighting XXI 2017
Country	United States
City	San Francisco
Period	30/01/17 → 1/02/17

Keywords

current efficiency
light-emitting diodes
thermal stability
Thick-shell quantum dots
type-II

Access to Document

10.1117/12.2252401

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Yu, H-C., & Vu, H. T. (2017). Improvement of thermal stability of type-II composition-gradient thick-shell quantum dots green light-emitting diodes. In M. R. Krames, J. K. Kim, L-W. Tu, & M. Strassburg (Eds.), Light-Emitting Diodes: Materials, Devices, and Applications for Solid State Lighting XXI [1012413] (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 10124). SPIE. https://doi.org/10.1117/12.2252401

Yu, Hsin-Chieh ; Vu, Hoang Tuan. / Improvement of thermal stability of type-II composition-gradient thick-shell quantum dots green light-emitting diodes. Light-Emitting Diodes: Materials, Devices, and Applications for Solid State Lighting XXI. editor / Michael R. Krames ; Jong Kyu Kim ; Li-Wei Tu ; Martin Strassburg. SPIE, 2017. (Proceedings of SPIE - The International Society for Optical Engineering).

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title = "Improvement of thermal stability of type-II composition-gradient thick-shell quantum dots green light-emitting diodes",

abstract = "Improvement of thermal stability of green quantum dot light emitting diodes (QD-LEDs) was demonstrated by using composition-gradient thick-shell CdSe@ZnS/ZnS quantum dots (QDs). The electroluminescence intensity only decreased 3% even when the operation temperature was elevated to 110 °C. The current efficiency roll-off effect was improved nearly 200% under higher current density. Thick-shell QDs with low defective structure could effectively prevent the electron-hole pairs from nonradiative Auger recombination and avoid the thermal-stress-induced expansion at higher temperatures and driving current. The maximum current efficiency of the thick-shell-device is 10.3 cd/A, which is much higher than 1.57 cd/A for the conventional thin-shell-device.",

keywords = "current efficiency, light-emitting diodes, thermal stability, Thick-shell quantum dots, type-II",

author = "Hsin-Chieh Yu and Vu, {Hoang Tuan}",

year = "2017",

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doi = "10.1117/12.2252401",

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series = "Proceedings of SPIE - The International Society for Optical Engineering",

publisher = "SPIE",

editor = "Krames, {Michael R.} and Kim, {Jong Kyu} and Li-Wei Tu and Martin Strassburg",

booktitle = "Light-Emitting Diodes",

note = "null ; Conference date: 30-01-2017 Through 01-02-2017",

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Yu, H-C & Vu, HT 2017, Improvement of thermal stability of type-II composition-gradient thick-shell quantum dots green light-emitting diodes. in MR Krames, JK Kim, L-W Tu & M Strassburg (eds), Light-Emitting Diodes: Materials, Devices, and Applications for Solid State Lighting XXI., 1012413, Proceedings of SPIE - The International Society for Optical Engineering, vol. 10124, SPIE, Light-Emitting Diodes: Materials, Devices, and Applications for Solid State Lighting XXI 2017, San Francisco, United States, 30/01/17. https://doi.org/10.1117/12.2252401

Improvement of thermal stability of type-II composition-gradient thick-shell quantum dots green light-emitting diodes. / Yu, Hsin-Chieh; Vu, Hoang Tuan.

Light-Emitting Diodes: Materials, Devices, and Applications for Solid State Lighting XXI. ed. / Michael R. Krames; Jong Kyu Kim; Li-Wei Tu; Martin Strassburg. SPIE, 2017. 1012413 (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 10124).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

TY - GEN

T1 - Improvement of thermal stability of type-II composition-gradient thick-shell quantum dots green light-emitting diodes

AU - Yu, Hsin-Chieh

AU - Vu, Hoang Tuan

PY - 2017/1/1

Y1 - 2017/1/1

N2 - Improvement of thermal stability of green quantum dot light emitting diodes (QD-LEDs) was demonstrated by using composition-gradient thick-shell CdSe@ZnS/ZnS quantum dots (QDs). The electroluminescence intensity only decreased 3% even when the operation temperature was elevated to 110 °C. The current efficiency roll-off effect was improved nearly 200% under higher current density. Thick-shell QDs with low defective structure could effectively prevent the electron-hole pairs from nonradiative Auger recombination and avoid the thermal-stress-induced expansion at higher temperatures and driving current. The maximum current efficiency of the thick-shell-device is 10.3 cd/A, which is much higher than 1.57 cd/A for the conventional thin-shell-device.

AB - Improvement of thermal stability of green quantum dot light emitting diodes (QD-LEDs) was demonstrated by using composition-gradient thick-shell CdSe@ZnS/ZnS quantum dots (QDs). The electroluminescence intensity only decreased 3% even when the operation temperature was elevated to 110 °C. The current efficiency roll-off effect was improved nearly 200% under higher current density. Thick-shell QDs with low defective structure could effectively prevent the electron-hole pairs from nonradiative Auger recombination and avoid the thermal-stress-induced expansion at higher temperatures and driving current. The maximum current efficiency of the thick-shell-device is 10.3 cd/A, which is much higher than 1.57 cd/A for the conventional thin-shell-device.

KW - current efficiency

KW - light-emitting diodes

KW - thermal stability

KW - Thick-shell quantum dots

KW - type-II

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AN - SCOPUS:85020313049

T3 - Proceedings of SPIE - The International Society for Optical Engineering

BT - Light-Emitting Diodes

A2 - Krames, Michael R.

A2 - Kim, Jong Kyu

A2 - Tu, Li-Wei

A2 - Strassburg, Martin

PB - SPIE

Y2 - 30 January 2017 through 1 February 2017

ER -

Yu H-C, Vu HT. Improvement of thermal stability of type-II composition-gradient thick-shell quantum dots green light-emitting diodes. In Krames MR, Kim JK, Tu L-W, Strassburg M, editors, Light-Emitting Diodes: Materials, Devices, and Applications for Solid State Lighting XXI. SPIE. 2017. 1012413. (Proceedings of SPIE - The International Society for Optical Engineering). https://doi.org/10.1117/12.2252401