λ-Ti₃O₅ thin film

Relatively easy production, large surface area (over 5x5mm²), stable phase transition

Overview

　λ-Ti₃O₅ is the unique oxide material that shows a photo-induced phase transition by visible-light irradiation. It is expected for application for optical recording media such as CD, DVD, and BD because of its low environmental impact compared to conventional chalcogenide materials. However, the crystal size of λ-Ti₃O₅ is limited to nanometer scale because of its metastable nature. This invention enables λ-Ti₃O₅ thin films with large surface area (over 5x5mm) using pulsed-laser deposition (PLD) method with TiO2 as a raw material.
　In a conventional method, λ-Ti₃O₅ could not be fabricated directly on substrates and an intermediate seed layer was required so that the seed layer component diffuses into λ-Ti₃O₅, which hindered the phase transition. On the other hand, this invention can synthesize λ-Ti₃O₅ thin films directly on a substrate without the seed layer, and thus the λ-Ti₃O₅ thin films show a stable phase transition.

Features・Outstandings

Product Application

・Application for optical recording media due to the photo-induced phase transition with visible-light irradiation　
・Switching device, sensor, and memory that can detect light, pressure, and heat
・Heat storage material that can preserve the thermal energy absorbed across the phase transition for a long time and can release it when needed by applying pressure

Related Works

[1] Cryst. Growth Des. 2022, 22, 1, 703–710

IP Data

IP No.　 ： PCT/JP2022/033363　　　
Inventor ： YOSHIMATSU Kohei
keyword ： photo-inducedphasetransition, λ-Ti3O5, opticalrecordingmedia, largesurfacearea, synthesizedirectlyonasubstrate, heatstoragematerial