Temperature-dependent photoluminescence in nitrogen-doped graphene quantum dots

Svette Reina Merden S. Santiago; Tzu-Neng Lin; Ji-Lin Shen

doi:10.1117/12.2307445

4 May 2018 Temperature-dependent photoluminescence in nitrogen-doped graphene quantum dots

Svette Reina Merden S. Santiago, Tzu-Neng Lin, Ji-Lin Shen

Proceedings Volume 10672, Nanophotonics VII; 1067246 (2018) https://doi.org/10.1117/12.2307445
Event: SPIE Photonics Europe, 2018, Strasbourg, France

Abstract

In this research, we have synthesized graphene quantum dots (GQDs) concurrent with N doping by pulsed laser ablation (PLA) of graphene oxide (GO) with urea. The synthesized N-doped GQDs (N-GQDs) with an average diameter less than 5 nm and N/C atomic ratio of 33.4% have been demonstrated by transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS), respectively. The temperature dependence of the photoluminescence (PL) intensity in GQDs and N-GQDs were investigated. The PL intensity of the GQDs was quenched monotonously with increasing temperature. However, an unusual enhancement of PL intensity in N-GQDs was observed with temperatures within the temperature range of around 50-150 K. We suggest that the distinct dependence of PL intensity of N-GQDs on the temperature originated from a carrier transfer mechanism between the N-dopant induced state (energy level) and quantum-dot emitting states. This study is rendered advantageous in understanding the effect of N-doping on the luminescence properties of GQDs useful for the potential applications.

Citation Download Citation

Svette Reina Merden S. Santiago, Tzu-Neng Lin, and Ji-Lin Shen "Temperature-dependent photoluminescence in nitrogen-doped graphene quantum dots", Proc. SPIE 10672, Nanophotonics VII, 1067246 (4 May 2018); https://doi.org/10.1117/12.2307445

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available