Oxygen vacancy-induced red light emission from flexible inorganic micropatterned p-CuO/n-ZnO heterojunction light-emitting diode

Pranab Biswas, Sung Doo Baek, Sang Hoon Lee, Jong Woo Kim, Ji Hyeon Park, Su Jeong Lee, Tae Il Lee, Jae Min Myoung

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Fully inorganic flexible light-emitting diodes (LEDs) were demonstrated by using CuO nanorods (NRs) and ZnO NRs as the hole and electron transport materials, respectively. The heterojunctions were fabricated inside 5 μm square patterns in order to achieve better flexibility. The current-voltage characteristic of the heterojunction revealed a typical p-n diode nature with an on-off ratio of 8.6 × 102 at 4 V, a turn-on voltage of 2.8 V, and a stable current flow at different voltage stress. The electroluminescence spectra from the LED at different forward bias exhibited eminent peak at around 710 nm corresponding to red light, which was in accordance with the deep-level emission of photoluminescence spectra of ZnO NRs. The Zn 2p and O 1s narrow-scan X-ray photoelectron spectra revealed that the deep levels are related to oxygen vacancies. The devices showed significant stability during bending test and continued to emit light beyond 1000 cycles of dynamic bending at a radius of curvature of 5 mm.

Original languageEnglish
Article number171102
JournalApplied Physics Letters
Volume109
Issue number17
DOIs
Publication statusPublished - 2016 Oct 24

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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