title: Efficient and tuneable photoluminescent boehmite hybrid nanoplates lacking metal activator centres for single-phase white LEDs.
abstract: White light-emitting diodes (WLEDs) are candidates to revolutionize the lighting industry towards energy efficient and environmental friendly lighting and displays. The current challenges in WLEDs encompass high luminous efficiency, chromatic stability, high colour-rending index and price competitiveness. Recently, the development of efficient and low-cost downconverting photoluminescent phosphors for ultraviolet/blue to white light conversion was highly investigated. Here we report a simple route to design high-efficient WLEDs by combining a commercial ultraviolet LED chip (InGaAsN, 390 nm) and boehmite (γ-AlOOH) hybrid nanoplates. Unusually high quantum yields (ηyield=38-58%) result from a synergic energy transfer between the boehmite-related states and the triplet states of the benzoate ligands bound to the surface of the nanoplates. The nanoplates with ηyield=38% are able to emit white light with Commission International de l'Eclairage coordinates, colour-rendering index and correlated colour temperature values of (0.32, 0.33), 85.5 and 6,111 K, respectively; overwhelming state-of-the-art single-phase ultraviolet-pumped WLEDs phosphors.
authors.affiliation: Department of Chemistry, CICECO, University of Aveiro, 3810-193 Aveiro, Portugal.
authors.forename: Xue
authors.initials: X
authors.lastname: Bai
authors.affiliation: Humboldt-Universität zu Berlin, Institut für Chemie, Brook-Taylor-Str. 2, 12489 Berlin, Germany.
authors.forename: Gianvito
authors.initials: G
authors.lastname: Caputo
authors.affiliation: Chinese Academy of Science, State Key Laboratory of Luminescence &Applications, Changchun Institute of Optics and Fine Mechanics &Physics, Changchun 130033, China.
authors.forename: Zhendong
authors.initials: Z
authors.lastname: Hao
authors.affiliation: Department of Physics and CICECO, University of Aveiro, 3810-193 Aveiro, Portugal.
authors.forename: Vânia T
authors.initials: VT
authors.lastname: Freitas
authors.affiliation: Chinese Academy of Science, State Key Laboratory of Luminescence &Applications, Changchun Institute of Optics and Fine Mechanics &Physics, Changchun 130033, China.
authors.forename: Jiahua
authors.initials: J
authors.lastname: Zhang
authors.affiliation: Departamento de Química Fundamental, Universidade Federal de Pernambuco, Recife-PE 50740-560, Brazil.
authors.forename: Ricardo L
authors.initials: RL
authors.lastname: Longo
authors.affiliation: Departamento de Química Fundamental, Universidade Federal de Pernambuco, Recife-PE 50740-560, Brazil.
authors.forename: Oscar L
authors.initials: OL
authors.lastname: Malta
authors.affiliation: Department of Physics and CICECO, University of Aveiro, 3810-193 Aveiro, Portugal.
authors.forename: Rute A S
authors.initials: RA
authors.lastname: Ferreira
authors.affiliation: Humboldt-Universität zu Berlin, Institut für Chemie, Brook-Taylor-Str. 2, 12489 Berlin, Germany.
authors.forename: Nicola
authors.initials: N
authors.lastname: Pinna