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http://hdl.handle.net/10773/20092
Title: | Efficient and tuneable photoluminescent boehmite hybrid nanoplates lacking metal activator centres for single-phase white LEDs |
Author: | Bai, Xue Caputo, Gianvito Hao, Zhendong Freitas, Vania T. Zhang, Jiahua Longo, Ricardo L. Malta, Oscar L. Ferreira, Rute A. S. Pinna, Nicola |
Keywords: | LIGHT-EMITTING-DIODES INTRAMOLECULAR ENERGY-TRANSFER CHARGE-TRANSFER STATE ONE-STEP SYNTHESIS OPTICAL-PROPERTIES BLUE PHOTOLUMINESCENCE MN2+ PHOSPHORS QUANTUM DOTS F-CENTER LUMINESCENCE |
Issue Date: | 2014 |
Publisher: | NATURE PUBLISHING GROUP |
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 (gamma-AlOOH) hybrid nanoplates. Unusually high quantum yields (eta(yield) = 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 eta(yield) = 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. |
Peer review: | yes |
URI: | http://hdl.handle.net/10773/20092 |
DOI: | 10.1038/ncomms6702 |
ISSN: | 2041-1723 |
Publisher Version: | 10.1038/ncomms6702 |
Appears in Collections: | CICECO - Artigos |
Files in This Item:
File | Description | Size | Format | |
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Efficient and tuneable photoluminescent boehmite hybrid nanoplates lacking metal activator centres for single-phase white LEDs_10.1038ncomms6702.pdf | 602.11 kB | Adobe PDF | View/Open |
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