Fig. 1: Photostability of emitters of three common commercial hBN samples in the air.
From: Prolonged photostability in hexagonal boron nitride quantum emitters
Photoluminescence (PL) spectra at time 0 s (upper panels) and time-traces from 0 s to 150 s (lower panels) with zero-phonon lines (ZPLs) near 1.98 eV in as-prepared (a) monolayer CVD, (b) multilayer CVD, and multilayer liquid exfoliated hBN with (c) type-I and (d) type-II emission. In the lower panel of (a), the blue arrow indicates a ZPL disappearing at approximately 5 s, while the red arrow highlights a new emission peak appearing at approximately 13 s, which is shifted +50 meV from the original ZPL, before completely losing emission signal. Representative time-dependent intensity at a fixed emission energy is plotted in blue lines of (e) monolayer CVD, (f) multilayer CVD, and multilayer liquid exfoliated hBN with (g) type-I and (h) type-II emission. Orange lines in (e) to (h) are fitting with a cluster analysis, details of which are presented in Supplementary Note 1. In (e) monolayer CVD hBN, discrete bleaching steps are observed, where each step may correspond to an individual emitter.
