Room-temperature optical emission properties of hydrothermal grown zinc oxide nanostructures

Authors

Erick John Carlo D Solibet National Institute of Physics, University of the Philippines Diliman
Melvin John Fernandez Empizo Institute of Laser Engineering, Osaka University
Maria Cecilia Moralde Angub Materials Science and Engineering Program, College of Science, University of the Philippines Diliman
Christopher Jude Tan Vergara Materials Science and Engineering Program, College of Science, University of the Philippines Diliman
Horace Andrew Fernandez Husay National Institute of Physics, University of the Philippines Diliman, Diliman, Quezon City 1101, Philippines
Verdad Canila Agulto Institute of Laser Engineering, Osaka University
Kohei Yamanoi Institute of Laser Engineering, Osaka University
Toshihiko Shimizu Institute of Laser Engineering, Osaka University
Elmer Surat Estacio National Institute of Physics, University of the Philippines Diliman
Arnel Angud Salvador National Institute of Physics, University of the Philippines Diliman
Nobuhiko Sarukura Institute of Laser Engineering, Osaka University
Armando Soriano Somintac National Institute of Physics, University of the Philippines Diliman

Abstract

We report on the room-temperature optical emissions of hydrothermal-grown zinc oxide (ZnO) nanostructures. The nanostructures were fabricated on seeded silicon (Si) substrates by hydrothermal growth method using different zinc acetate dihydrate [Zn(CH₃COO)·2H₂O, ZnAc] concentrations. Regardless of the ZnAc concentration, all nanostructures exhibit well-defined hexagonal facets and intense near-band-edge ultraviolet (UV) emissions. However, increasing the ZnAc concentration leads ZnO nanostructures which exhibit longer emission lifetimes and a secondary red-shifted UV emission around 392 nm. These changes in the nanostructures' UV emission properties are attributed to the multiple excitation/absorption and emission processes of coalescent structures and/or structures sharing common sides or boundaries. Our results suggest that for UV scintillator applications, this phenomenon in ZnO nanostructures can be reduced by using lower (< 100 mM) ZnAc concentrations during hydrothermal growth.

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Issue

2020: Proceedings of the 38th Samahang Pisika ng Pilipinas Physics Conference

Article ID

SPP-2020-2C-02

Section

Condensed Matter Physics and Materials Science

Published

2020-10-19

How to Cite

[1]

EJCD Solibet, MJF Empizo, MCM Angub, CJT Vergara, HAF Husay, VC Agulto, K Yamanoi, T Shimizu, ES Estacio, AA Salvador, N Sarukura, and AS Somintac, Room-temperature optical emission properties of hydrothermal grown zinc oxide nanostructures, Proceedings of the Samahang Pisika ng Pilipinas 38, SPP-2020-2C-02 (2020). URL: https://proceedings.spp-online.org/article/view/SPP-2020-2C-02.