Evaluation of photoluminescence quantum yield of monolayer WSe2 using reference dye of 3-borylbithiophene derivative

• Published in: Physica Status Solidi (B) Basic Research
• Main Author: Mohamed N.B.; Wang F.; Lim H.E.; Zhang W.; Koirala S.; Mouri S.; Miyauchi Y.; Matsuda K.
• Format: Article
• Language: English
• Published: Wiley-VCH Verlag 2017
• Online Access: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85012932757&doi=10.1002%2fpssb.201600563&partnerID=40&md5=0fa3e035ecf1a1a3b8cc27c0b6aa2381
• ISSN: 3701972
• DOI: 10.1002/pssb.201600563

We studied an evaluation method of photoluminescence (PL) quantum yield of monolayer transition metal chalcogenides (TMDs) on a transparent substrate using a reference dye. A 3-borylbithiophene derivative (C58H49BN2S4) reference dye shows a high PL quantum yield of 36% even in the solid form and the high quantum yield is kept in a Poly(methyl methacrylate) (PMMA) matrix. Moreover, the photon energy of PL is similar to those of monolayer TMDs. These PL characteristics of the reference dye are useful for a evaluation of PL quantum yield in monolayer TMDs. The PL quantum yield of 0.18 ± 0.03% was evaluated for mechanically exfoliated monolayer WSe2 on glass substrate at room temperature. © 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim