title: Temperature-Dependent Photoluminescence of g-C3N4: Implication for Temperature Sensing.
abstract: We report the temperature-dependent photoluminescence (PL) properties of polymeric graphite-like carbon nitride (g-C3N4) and a methodology for the determination of quantum efficiency along with the activation energy. The PL is shown to originate from three different pathways of transitions: σ*-LP, π*-LP, and π*-π, respectively. The overall activation energy is found to be ∼73.58 meV which is much lower than the exciton binding energy reported theoretically but ideal for highly sensitive wide-range temperature sensing. The quantum yield derived from the PL data is 23.3%, whereas the absolute quantum yield is 5.3%. We propose that the temperature-dependent PL can be exploited for the evaluation of the temperature dependency of quantum yield as well as for temperature sensing. Our analysis further indicates that g-C3N4 is well-suited for wide-range temperature sensing.
authors.affiliation: Materials Research Centre, Indian Institute of Science , Bangalore 560012, India.
authors.forename: Debanjan
authors.initials: D
authors.lastname: Das
authors.affiliation: Materials Research Centre, Indian Institute of Science , Bangalore 560012, India.
authors.forename: S L
authors.initials: SL
authors.lastname: Shinde
authors.affiliation: Materials Research Centre, Indian Institute of Science , Bangalore 560012, India.
authors.forename: K K
authors.initials: KK
authors.lastname: Nanda
keywords: activation energy; nitride; photoluminescence; quantum efficiency; sensing