Chemistry - An Asian Journal
Chemistry - An Asian Journal
5 years ago

Tuning 2D Light Upconversion Emission by Modulating Phonon Relaxation

Tuning 2D Light Upconversion Emission by Modulating Phonon Relaxation
Hyung Min Kim, Bum Jin Kim, Youngho Cho, Soo Yeong Lim, Yung Doug Suh, Chan Ryang Park, Sang Hwan Nam
The photonic upconversion in rare earth atoms is widely used to convert “invisible” near infrared photons to “visible” photons with continuous wave light. By using a patterned substrate, upconversion become a route for creating new information-incorporating security codes. The amount of information in the cipher increases in proportion to the number of emission colors as well as the pattern structure. Subsequently, changing the chemical composition of upconversion phosphors on 2 D substrates is required to manufacture information-rich upconversion cryptography. In this study, we exploited temperature-controlled thermal reaction on upconversion films deposited on a quartz substrate to prepare security information codes. Multiple color emission was generated from upconversion films as the result of inserting high-frequency molecular oscillators into the film structures. Fourier-transform infrared (FTIR) and time-resolved study corroborated the mechanism of spectral variation of upconversion films. Multicolor upconversion emission: 2 D upconversion films were prepared with pulsed laser deposition and their emission colors were fine-tuned by thermal surface reaction with H2O vapor. The photophysics of radiative and non-radiative relaxation in the films was investigated with FTIR and time-resolved studies.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/asia.201700782

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