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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 10 — May. 20, 2013
  • pp: 12519–12526

Visible cathodoluminescence of quantum dot films by direct irradiation of electron beam and its materialization as a field emission device

Ju Yeon Woo, Jongsoo Lee, Hansung Lee, Naesung Lee, Ji Hye Oh, Young Rag Do, and Chang-Soo Han  »View Author Affiliations

Optics Express, Vol. 21, Issue 10, pp. 12519-12526 (2013)

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The field emission (FE) device based on quantum dot (QD) films as a cathodoluminescent (CL) material has not emerged yet due to the relatively low quantum efficiency and weak photostability of nanocrystals (NCs). Here we improve film stability and luminescence yields by preparing neat films of well-packed core–multishell QDs using spray coating method and then using low-temperature atomic layer deposition (ALD) to infill the pores of these films with metal oxides to produce inorganic nanocomposites. The ALD coatings to protect oxidation and degradation by electrons prevent internal atomic and molecular diffusion and decrease surface trap densities of QD films. Furthermore, the CL of the core-multishell QD films is 2.4 times higher than before ALD infilling. We fabricate the FE device by combining cathode structure with carbon nanotube (CNT) emitters and anode plates with QD thin film and successfully can get brilliant images of the light-emitting FE device. Our research opens a way for developing new quantum optoelectronics with high-performance.

© 2013 OSA

OCIS Codes
(160.2540) Materials : Fluorescent and luminescent materials
(230.5590) Optical devices : Quantum-well, -wire and -dot devices
(250.1500) Optoelectronics : Cathodoluminescence
(310.6845) Thin films : Thin film devices and applications

ToC Category:
Optical Devices

Original Manuscript: March 19, 2013
Revised Manuscript: May 7, 2013
Manuscript Accepted: May 8, 2013
Published: May 14, 2013

Ju Yeon Woo, Jongsoo Lee, Hansung Lee, Naesung Lee, Ji Hye Oh, Young Rag Do, and Chang-Soo Han, "Visible cathodoluminescence of quantum dot films by direct irradiation of electron beam and its materialization as a field emission device," Opt. Express 21, 12519-12526 (2013)

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