The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 24, 2013
Filed:
Apr. 26, 2011
Ki-seok Kim, Gwangju, KR;
Gun-young Jung, Gwangju, KR;
Sang-mook Kim, Gwangju, KR;
Mun-seok Jeong, Gwangju, KR;
Hyun Jeong, Gwangju, KR;
Ki-Seok Kim, Gwangju, KR;
Gun-Young Jung, Gwangju, KR;
Sang-Mook Kim, Gwangju, KR;
Mun-Seok Jeong, Gwangju, KR;
Hyun Jeong, Gwangju, KR;
Gwangju Institute of Science and Technology, Gwangju, KR;
Abstract
The light extraction efficiency of a typical light-emitting diode (LED) is improved by incorporating one-dimensional ZnO nanorods. The light extraction efficiency is improved about 31% due to the waveguide effect of ZnO sub-microrods, compared to an LED without the nanorods. Other shapes of ZnO microrods and nanorods are produced using a simple non-catalytic wet chemical growth method at a low temperature on an indium-tin-oxide (ITO) top contact layer with no seed layer. The crystal morphology of a needle-like or flat top hexagonal structure and the density and size of ZnO microrods and nanorods are easily modified by controlling the pH value and growth time. The waveguide phenomenon in each ZnO rod is observed using confocal scanning electroluminescence microscopy (CSEM) and micro-electroluminescence spectra (MES).