Characteristics of multilayered barium titanate films and their effect on thin-film electroluminescent cells

Yun-Hi Lee, Jung Hoon Oh, Byeong Kwon Ju, Myung Hwan Oh

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

In this work, we fabricated thin-film electroluminescent (TFEL) cells with a new multilayered BaTiO 3 layer for the low-voltage-driven devices. At first, we performed the voltage accelerated breakdown testing of the multilayered BaTiO 3 having both high dielectric constant and high breakdown strength. The time-zero-breakdown distribution is shown to be dependent on surface roughness, while the long-term failure studied by time-dependent dielectric breakdown technique at high field is dependent on the bulk characteristics, i.e., transition layer within multilayered BaTiO 3 (m-BT) films. Second, the TFEL devices were prepared using the multilayered BaTiO 3 as dielectric materials. We observed a decrease of turn-on voltage with increasing thickness and increase of the maximum overvoltage. Third, typical symmetric capacitance-voltage and internal charge-phosphor field characteristics were obtained for the device with thin m-BT layers. With increasing thickness of m-BT the significant asymmetry with respect to the applied voltage polarity was observed. This is a main difference as compared with the symmetric characteristics of conventional TFEL devices with low dielectric constant insulators. The experimental results indicate that a selection of the thickness of upper m-BT and their deposition process would strongly affect the interfacial characteristics as well as bulk characteristics of an as-grown ZnS:Pr,Ce layer.

Original languageEnglish
Pages (from-to)4374-4378
Number of pages5
JournalJournal of the Electrochemical Society
Volume147
Issue number11
DOIs
Publication statusPublished - 2000 Nov 1
Externally publishedYes

Fingerprint

Barium titanate
barium
Luminescent devices
Thin films
breakdown
Electric potential
thin films
cells
Electric breakdown
electric potential
Permittivity
permittivity
overvoltage
transition layers
Phosphors
Capacitance
Surface roughness
low voltage
phosphors
polarity

ASJC Scopus subject areas

  • Electrochemistry
  • Surfaces, Coatings and Films
  • Surfaces and Interfaces

Cite this

Characteristics of multilayered barium titanate films and their effect on thin-film electroluminescent cells. / Lee, Yun-Hi; Oh, Jung Hoon; Ju, Byeong Kwon; Oh, Myung Hwan.

In: Journal of the Electrochemical Society, Vol. 147, No. 11, 01.11.2000, p. 4374-4378.

Research output: Contribution to journalArticle

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