Intense deep-blue electroluminescence from ITO/Y₂O₃/Ag structure

Area of Science:

• Solid State Physics
• Materials Science
• Optoelectronics

Background:

• Indium ion (In) luminescence is crucial for various optoelectronic applications.
• Efficient insulation layers are essential for high-performance indium ion emission devices.
• Previous research has explored various materials for insulating layers in such devices.

Purpose of the Study:

• To fabricate and characterize indium ion luminescence devices utilizing Y₂O₃ insulator films.
• To investigate the luminescence mechanism and electrical properties of the fabricated devices.
• To enhance device performance by employing Y₂O₃/In₂O₃ multilayer insulation.

Main Methods:

• Fabrication of Indium Tin Oxide (ITO)/Y₂O₃/Silver (Ag) devices with Y₂O₃ thin films.
• Analysis of luminescence spectra, observing characteristic indium ion transitions (InI, InII, InIII).
• Cross-sectional analysis and surface morphology studies to understand the luminescence mechanism.
• Current-voltage (I-V) characteristic measurements to determine device electrical properties.
• Fabrication and testing of devices with Y₂O₃/In₂O₃ multilayer insulation.

Main Results:

• Observed four sharp luminescence lines corresponding to InI, InII, and InIII transitions.
• Demonstrated device turn-on voltage of 10V with typical diode characteristics.
• Identified K-shell electron loss under strong electric fields as the luminescence mechanism.
• Achieved improved device performance, including excellent Commission Internationale de l'Éclairage (CIE) coordinates (0.16, 0.03), using Y₂O₃/In₂O₃ multilayer films.

Conclusions:

• Y₂O₃ films serve as effective insulators for indium ion luminescence devices.
• The luminescence mechanism involves characteristic radiation from indium ions due to K-shell electron loss.
• Y₂O₃/In₂O₃ multilayer insulation significantly enhances device performance and color purity.