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Optics Letters

Optics Letters


  • Editor: Alan E. Willner
  • Vol. 38, Iss. 1 — Jan. 1, 2013
  • pp: 7–9

Cadmium-free quantum dot light emitting devices: energy-transfer realizing pure blue emission

Wenyu Ji, Pengtao Jing, Yi Fan, Jialong Zhao, Yunjun Wang, and Xianggui Kong  »View Author Affiliations

Optics Letters, Vol. 38, Issue 1, pp. 7-9 (2013)

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In this study, deep blue, pure electroluminescence (EL) at 441.5 nm from a ZnSe/ZnS quantum dot light-emitting device (QD-LED) is obtained by using poly (4-butylphenyl-diphenyl-amine) (poly-TPD) as the hole-transport layer (HTL) to open up the channel for energy transfer from poly-TPD to QDs. The emission originating from HTL is observed in the QD-LED with N,N-bis (tolyl)-N,N-diphenyl-1,1-biphenyl-4,4-diamine functionalized with two styryl groups (2-TPD) as the HTL due to inefficient energy-transfer from 2-TPD to QDs. The poly-TPD based device exhibits color-saturated blue emission with a narrow spectral bandwidth of full width at half maximum (17.2nm). These results explore the operating mechanism of the QD EL and signify a remarkable progress in deep blue QD-LEDs based on environmental-friendly QD materials.

© 2012 Optical Society of America

OCIS Codes
(230.3670) Optical devices : Light-emitting diodes
(230.4170) Optical devices : Multilayers
(260.2160) Physical optics : Energy transfer
(260.3800) Physical optics : Luminescence
(330.1690) Vision, color, and visual optics : Color
(160.4236) Materials : Nanomaterials

ToC Category:
Optical Devices

Original Manuscript: October 26, 2012
Revised Manuscript: November 12, 2012
Manuscript Accepted: November 13, 2012
Published: December 20, 2012

Virtual Issues
Vol. 8, Iss. 2 Virtual Journal for Biomedical Optics

Wenyu Ji, Pengtao Jing, Yi Fan, Jialong Zhao, Yunjun Wang, and Xianggui Kong, "Cadmium-free quantum dot light emitting devices: energy-transfer realizing pure blue emission," Opt. Lett. 38, 7-9 (2013)

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