Coloured materials and photoluminescence centres in anodic film on aluminium

Yamamoto, Yūzō; Baba, Naomichi; Tajima, S.

doi:10.1038/289572a0

Cited by 144 publications

(117 citation statements)

References 11 publications

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“…2a and Supplementary Fig. 12a), resembling that previously observed in boehmite 26,38 , Al 2 O 3 (refs 30-34) and Al-based 35 nanoparticles and assigned to lattice anionic oxygen vacancies (F or F þ centres). When the crystallite size increases (W2), the emission spectrum becomes broader and shifts towards the red ( ARTICLE excitation spectra of W1 with those of B1 ( Fig.…”

Section: Resultssupporting

confidence: 60%

“…2a and Supplementary Fig. 10b), being ascribed, in the literature, to the presence of surface defects 26,27,35,37 .…”

Section: Resultsmentioning

confidence: 99%

“…Luminescent metal oxide nanoparticles may offer a possible alternative to meet the material demand for ultraviolet-pumped WLED, mainly because of their high stability, simplicity, low toxicity and low cost. The fluorescence properties of Al 2 O 3 or g-AlOOH (boehmite) nanoparticles have already been studied [26][27][28][29][30][31][32][33][34][35][36][37][38] . For instance, these nanoparticles present emission in the ultraviolet and blue spectral regions due to lattice anion vacancies (F and F þ centres or grouping of these two defects) [30][31][32][33][34][35][36][37][38] excited through absorption of anionic vacancies below 300 nm, mismatching the pumped wavelength (350-420 nm) of commercial ultraviolet chips [26][27][28][29][30][31][32][33][34][35][36][37][38] .…”

mentioning

confidence: 99%

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

et al. 2014

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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 colourrending 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 (g-AlOOH) hybrid nanoplates. Unusually high quantum yields (Z yield ¼ 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 Z yield ¼ 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.

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Section: Resultssupporting

confidence: 60%

“…2a and Supplementary Fig. 10b), being ascribed, in the literature, to the presence of surface defects 26,27,35,37 .…”

Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

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

et al. 2014

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“…The outer layer disturbs the transmittance of the light from the excitation source and the emission of the light from the middle layer. [19] For this reason, when the pore diameter is enlarged, the thickness of the outer layer is reduced and, thus, the intensity of the PL oscillations increases. However, for longer etching times (i.e.…”

Section: Doi: 101002/adma201104490mentioning

confidence: 98%

Nanoporous Anodic Alumina Barcodes: Toward Smart Optical Biosensors

et al. 2012

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“…Studying the (photoluminescence) PL properties of the AAM itself for practical applications is important, because the properties of the AAM certainly affect the properties of materials based on AAM. Yamamoto et al (7) proposed, as early as in 1981, that the oxalic impurities incorporated in the AAMs can be transformed into luminescent centres by a high electric-field set-up inside the pores, showing a blue PL band around 470 nm. Du et al (8) and Li et al (9) have attributed the blue emission band to the singly ionized oxygen vacancies of 6.0 wt % H 3 PO 4 and 1.8 wt % H 2 CrO 4 at 60°C for 1 h to remove the alumina layers.…”

Section: Introductionmentioning

confidence: 99%

The effect of high‐temperature annealing on optical properties of porous anodic alumina formed in oxalic acid

Huang

2007

Luminescence

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Photoluminescence (PL) of anodic alumina membranes (AAMs) with ordered nanopore arrays fabricated in oxalic acid has been investigated under different annealing temperatures. X-ray diffraction reveals the structural transition from the amorphous state to crystallization. PL measurements show that a blue PL band occurs in the wavelength range 300-600 nm. The differential thermal analysis (DTA) and thermogravimetric analysis (TG) results revealed plentiful oxalic ions incorporated into the prepared AAMs. The PL band of AAMs could be attributed to the co-actions of the oxygen vacancies (F(+) and F centres) and the luminescent centres transformed from oxalic impurities. With the increase of the annealing temperature, the intensities of PL increase first, and at 500 degrees C reach a maximum value, then decrease. The PL phenomenon is intimately related to the temperature-induced structural transitions. There are three optical centres in the annealed AAMs; the first is originates from the F centres, the second is correlated with F(+) centres and the third is associated with the oxalic impurities incorporated in the AAMs.

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Coloured materials and photoluminescence centres in anodic film on aluminium

Cited by 144 publications

References 11 publications

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

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

Nanoporous Anodic Alumina Barcodes: Toward Smart Optical Biosensors

The effect of high‐temperature annealing on optical properties of porous anodic alumina formed in oxalic acid

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