title: Multi-section core-shell InGaN/GaN quantum-well nanorod light-emitting diode array.
abstract: The growth of a two-section, core-shell, InGaN/GaN quantum-well (QW) nanorod- (NR-) array light-emitting diode device based on a pulsed growth technique with metalorganic chemical vapor deposition is demonstrated. A two-section n-GaN NR is grown through a tapering process for forming two uniform NR sections of different cross-sectional sizes. The cathodoluminescence (CL), photoluminescence (PL), and electrolumines-cence (EL) characterization results of the two-section NR structure are compared with those of a single-section NR sample, which is prepared under the similar condition to that for the first uniform NR section of the two-section sample. All the CL, PL, and EL spectra of the two-section sample (peaked between 520 and 525 nm) are red-shifted from those of the single-section sample (peaked around 490 nm) by >30 nm in wavelength. Also, the emitted spectral widths of the two-section sample become significantly larger than their counterparts of the single-section sample. The PL spectral full-width at half-maximum increases from ~37 to ~61 nm. Such variations are attributed to the higher indium incorporation in the sidewall QWs of the two-section sample due to the stronger strain relaxation in an NR section of a smaller cross-sectional size and the more constituent atom supply from the larger gap volume between neighboring NRs.
authors.forename: Charng-Gan
authors.initials: CG
authors.lastname: Tu
authors.forename: Yu-Feng
authors.initials: YF
authors.lastname: Yao
authors.forename: Che-Hao
authors.initials: CH
authors.lastname: Liao
authors.forename: Chia-Ying
authors.initials: CY
authors.lastname: Su
authors.forename: Chieh
authors.initials: C
authors.lastname: Hsieh
authors.forename: Chi-Ming
authors.initials: CM
authors.lastname: Weng
authors.forename: Chun-Han
authors.initials: CH
authors.lastname: Lin
authors.forename: Hao-Tsung
authors.initials: HT
authors.lastname: Chen
authors.forename: Yean-Woei
authors.initials: YW
authors.lastname: Kiang
authors.forename: C C
authors.initials: CC
authors.lastname: Yang