Room temperature deep UV photoluminescence from low dimensional hexagonal boron nitride prepared using a facile synthesis

TL;DR

This study presents a simple synthesis method for hexagonal boron nitride that produces defect-related deep UV photoluminescence at room temperature, revealing potential for quantum applications.

Contribution

A new facile synthesis route for h-BN that generates specific defect types emitting in the deep UV range at room temperature.

Findings

Optical energy gap of 5.28 eV consistent with exfoliated h-BN

Identification of defects emitting at 4.18 eV and 3.44 eV

Deep UV emission shows oscillatory excitation dependence

Abstract

Evaluation of the defect levels in low-dimensional materials is an important aspect of quantum science. In this article, we report a facile synthesis method of hexagonal boron nitride (h-BN) and evaluate the defects and their light emission characteristics. The thermal annealing procedure is optimized to obtain clean h-BN. The UV-Vis spectroscopy shows the optical energy gap of 5.28 eV which is comparable to the reported energy gap for exfoliated, clean h-BN samples. The optimized synthesis route of h-BN has generated two kinds of defects which are characterised using room temperature photoluminescence measurements. The defects emit light at 4.18 eV (in deep ultraviolet region) and 3.44 eV (ultraviolet), respectively. The defect emitting deep ultraviolet (DUV) has oscillatory dependency on the excitation energy, while that emitting 3.44 eV light (ZPL3.44 eV) has a phonon bands with mean energy level separation of 125 meV measured at room temperature. This agrees very well with the Franck-Condon-like structure having regularly spaced energy levels, which are typical indications of single defect levels in the low dimensional h-BN.