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All Journal International Journal of Power Electronics and Drive Systems (IJPEDS)
Tung Vo Thanh
Posts and Telecommunications Institute of Technology
Control & Systems Engineering Electrical & Electronics Engineering

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Enhancing scattering strength improvement and color uniformity in white light-emitting diodes using high concentration of cobalt(II) oxide Tung Vo Thanh; Phan Xuan Le; Nguyen Doan Quoc Anh
International Journal of Power Electronics and Drive Systems (IJPEDS) Vol 17, No 3: September 2026
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijpeds.v17.i3.pp1974-1981

Abstract

The study herein investigates the structural development of cobalt(II) oxide (CoO) thin films grown on Ag (0 0 1) substrates and evaluates their impact on optical performance in white light-emitting diodes (WLEDs). The structural and chemical properties of CoO films were characterized using grazing-incidence X-ray diffraction (GIXD), Xray photoelectronic spectroscopic (XPS), as well as low-power electronic diffracting (LEED). The outcomes reveal that CoO films initially grow pseudomorphically up to 3-4 monolayers, followed by gradual relaxation toward the bulk lattice parameter. A periodic mismatch dislocation network forms at approximately 8 monolayers, leading to lattice tilting and the formation of ordered nanoscale domains. In addition, the incorporation of CoO as a scattering material in WLEDs significantly improves light scattering and color uniformity, while maintaining stable luminous performance. Compared with conventional scattering materials, CoO demonstrates lower scattering loss and reduced chromatic deviation, making it a promising candidate for high-precision optoelectronic applications.
Co-Authors Nguyen Doan Quoc Anh Phan Xuan Le