Premium
Nonlinear Optical Properties and Temperature‐Dependent UV–Vis Absorption and Photoluminescence Emission in 2D Hexagonal Boron Nitride Nanosheets
Author(s) -
Kumbhakar Pathik,
Kole Arup Kanti,
Tiwary Chandra Sekhar,
Biswas Subrata,
Vinod Soumya,
TahaTijerina Jaime,
Chatterjee Udit,
Ajayan Pulickel M.
Publication year - 2015
Publication title -
advanced optical materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.89
H-Index - 91
ISSN - 2195-1071
DOI - 10.1002/adom.201400445
Subject(s) - materials science , photoluminescence , graphene , absorption (acoustics) , two photon absorption , band gap , optoelectronics , photonics , saturable absorption , nanotechnology , laser , optics , wavelength , physics , fiber laser , composite material
Recently, a lot of interest has been centred on the optical properties of hexagonal boron nitride (h‐BN), which has a similar lattice structure to graphene. Interestingly, h‐BN has a wide bandgap and is biocompatible, so it has potential applications in multiphoton bioimaging, if it can exhibit large nonlinear optical (NLO) properties. However, extensive investigation into the NLO properties of h‐BN have not been done so far. Here, NLO properties of 2D h‐BN nanosheets (BNNS) are reported for the first time, using 1064‐nm NIR laser radiation with a pulse duration of 10 ns using the Z ‐scan technique. The reverse saturable absorption occurs in aqueous colloidal solutions of BNNS with a very large two‐photon absorption cross section ( σ 2PA ) of ≈57 × 10 −46 cm 4 s −1 photon −1 . Also, by using UV–Vis absorption spectroscopy, the temperature coefficient of the bandgap (d E g /d T ) of BNNS is determined to be 5.9 meV K −1 . Further defect‐induced photoluminescence emission in the UV region is obtained in the 283–303 K temperature range, under excitations of different wavelengths. The present report of large σ 2PA combined with stability and biocompatibility could open up new possibilities for the application of BNNS as a potential optical material for multiphoton bioimaging and advanced photonic devices.