Single-photon upconversion in 6-pentaceneone crystal from bulk to ultrathin flakes

Area of Science:

• Organic Optoelectronics
• Photonics
• Materials Science

Background:

• Single-photon upconversion is a crucial process in photonics.
• Previous demonstrations were limited to inorganic materials.
• Organic materials offer unique advantages for optoelectronic applications.

Purpose of the Study:

• To demonstrate phonon-assisted single-photon upconversion in organic materials for the first time.
• To investigate the properties of 6-pentaceneone crystals for upconversion applications.
• To explore the potential of ultrathin organic flakes in photonics.

Main Methods:

• Utilized 6-pentaceneone crystals for optical experiments.
• Analyzed linear pumping power-dependent anti-Stokes photoluminescence (ASPL).
• Measured nanosecond photoluminescence (PL) lifetime and temperature-dependent ASPL.
• Investigated mechanical exfoliation to create ultrathin flakes.

Main Results:

• Successfully demonstrated phonon-assisted single-photon upconversion in 6-pentaceneone.
• Observed power-dependent ASPL and quenched ASPL at low temperatures.
• Confirmed the mechanical exfoliation of 6-pentaceneone into ultrathin flakes.
• Revealed thickness-dependent photoluminescence in the exfoliated flakes.

Conclusions:

• Phonon-assisted single-photon upconversion is achievable in organic materials.
• 6-pentaceneone crystals are promising candidates for upconversion applications.
• Ultrathin organic flakes offer tunable photoluminescence properties.