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Optics Letters

Optics Letters


  • Editor: Alan E. Willner
  • Vol. 38, Iss. 12 — Jun. 15, 2013
  • pp: 2080–2082

ZnxCd1−xS quantum dots–based white light-emitting diodes

Hong-Shuo Chen, Kuan-Wen Wang, Sheng-Shiun Chen, and Shu-Ru Chung  »View Author Affiliations

Optics Letters, Vol. 38, Issue 12, pp. 2080-2082 (2013)

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In this study, two kinds of colloidal ternary semiconductor white light-emitting quantum dots (WQDs), Zn0.5Cd0.5S and Zn0.8Cd0.2S, are prepared and used as nanophosphors in a UV light-emitting diode (UV-LED) pumping device. When the weight ratio of Zn0.5Cd0.5S WQDs is 9.1 wt. % in silicone and the drive current is set at 20 mA, the chromaticity coordinates (CIE), correlated color temperature (CCT), color rendering index (CRI), and luminous efficiency are (0.43,0.37), 2830 K, 90, and 0.94lm/W, respectively. On the other hand, under the same weight ratio in silicone, the CIE, CCT, CRI, and luminous efficiency of Zn0.8Cd0.2S WQDs are (0.36,0.33), 4240 K, 86, and 4.12lm/W, respectively. Based on the above results, we can conclude that WQDs-based LED can be obtained by controlling the compositions of ZnxCd1xS QDs due to the coexistence of band-edge and surface state emission.

© 2013 Optical Society of America

OCIS Codes
(230.3670) Optical devices : Light-emitting diodes
(230.5590) Optical devices : Quantum-well, -wire and -dot devices
(240.6700) Optics at surfaces : Surfaces

ToC Category:
Optical Devices

Original Manuscript: March 4, 2013
Revised Manuscript: April 11, 2013
Manuscript Accepted: April 22, 2013
Published: June 7, 2013

Hong-Shuo Chen, Kuan-Wen Wang, Sheng-Shiun Chen, and Shu-Ru Chung, "ZnxCd1−xS quantum dots–based white light-emitting diodes," Opt. Lett. 38, 2080-2082 (2013)

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