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Efficient and tuneable photoluminescent boehmite hybrid nanoplates lacking metal activator centres for single-phase white LEDs

Author

Listed:
  • Xue Bai

    (CICECO, University of Aveiro
    Present Address: State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012, China)

  • Gianvito Caputo

    (Humboldt-Universität zu Berlin, Institut für Chemie, Brook-Taylor-Str. 2, 12489 Berlin, Germany)

  • Zhendong Hao

    (Chinese Academy of Science, State Key Laboratory of Luminescence & Applications, Changchun Institute of Optics and Fine Mechanics & Physics)

  • Vânia T. Freitas

    (University of Aveiro)

  • Jiahua Zhang

    (Chinese Academy of Science, State Key Laboratory of Luminescence & Applications, Changchun Institute of Optics and Fine Mechanics & Physics)

  • Ricardo L. Longo

    (Universidade Federal de Pernambuco)

  • Oscar L. Malta

    (Universidade Federal de Pernambuco)

  • Rute A.S. Ferreira

    (University of Aveiro)

  • Nicola Pinna

    (Humboldt-Universität zu Berlin, Institut für Chemie, Brook-Taylor-Str. 2, 12489 Berlin, Germany)

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.

Suggested Citation

  • Xue Bai & Gianvito Caputo & Zhendong Hao & Vânia T. Freitas & Jiahua Zhang & Ricardo L. Longo & Oscar L. Malta & Rute A.S. Ferreira & Nicola Pinna, 2014. "Efficient and tuneable photoluminescent boehmite hybrid nanoplates lacking metal activator centres for single-phase white LEDs," Nature Communications, Nature, vol. 5(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:5:y:2014:i:1:d:10.1038_ncomms6702
    DOI: 10.1038/ncomms6702
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