title: En route to white-light generation utilizing nanocomposites composed of ultrasmall CdSe nanodots and excited-state intramolecular proton transfer dyes.
abstract: One single material that emits white light is of paramount interest for the development of white light-emitting diodes (WLEDs). Here we report a novel nanocomposite, in which a new type of excited-sate intramolecular proton transfer (ESIPT) molecule, namely 5-(1,2-dithiolan-3-yl)-N-(2-{[4-(3-hydroxy-4-oxo-4H-chromen-2-yl)phenyl](methyl)amino}ethyl)pentanamide (HF-N-LA), is anchored onto the surface of ultrasmall CdSe quantum dots through dithiol functionality. Authentic white light with a CIE coordinate of (0.33, 0.33) could then be generated by confluence of 440 nm emission from CdSe and 570 nm proton-transfer tautomer emission from HF-N-LA. Moreover, linear color tunability could be achieved simply by altering relative amount of the two species, i.e., number of HF-N-LA onto CdSe, in one single nanocomposite, thus opening an innovative route toward applying nanocrystals in the field of WLEDs.
authors.affiliation: Department of Chemistry, National Taiwan University, 1 Roosevelt Rd., Sec. 4 Taipei 106, Taiwan.
authors.forename: Hsin-Chieh
authors.initials: HC
authors.lastname: Peng
authors.forename: Chia-Cheng
authors.initials: CC
authors.lastname: Kang
authors.forename: Ming-Ren
authors.initials: MR
authors.lastname: Liang
authors.forename: Chun-Yen
authors.initials: CY
authors.lastname: Chen
authors.forename: Alexander
authors.initials: A
authors.lastname: Demchenko
authors.forename: Chao-Tsen
authors.initials: CT
authors.lastname: Chen
authors.forename: Pi-Tai
authors.initials: PT
authors.lastname: Chou