Decay dynamics of blue–green luminescence in meso-porous MCM-41 nanotubes

Lee, Y.C.; Liu, Y.L.; Wang, C.K.; Shen, Ji Lin; Cheng, Po Wen; Cheng, Chi Feng; Ko, Chang Hyun; Lin, Tai‐Yuan

doi:10.1016/j.jlumin.2004.10.026

Cited by 11 publications

(7 citation statements)

References 31 publications

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“…We found that the observed decay dynamics can be described by a stretched exponential function where I 0 is the PL intensity at t = 0, τ is a characteristic decay time, and β is a stretching parameter that represents the degree of deviation from a pure exponential decay. As mentioned in the Introduction, a similar stretched exponential decay on a time scale of nanoseconds has been observed from Si- and SiO 2 -based nanostructured materials. − We should also note that the stretched exponential PL decay can generally be found in disordered systems in which the dispersive diffusion of photoexcited electrons and/or holes are possible. , The dispersive diffusion of carriers most likely results from the excitation of carriers from localized to extended states or hopping among localized states. , Because the PL decays shown in Figures and have a characteristic decay time of several nanoseconds, we consider that the present PL processes are ascribed to the allowed singlet-to-singlet transitions and the subsequent diffusion-controlled electron−hole recombination processes.…”

Section: Resultssupporting

confidence: 60%

“…This blue emission is characterized by a broad PL peak centered at ∼450 nm and a nonexponential decay function on a time scale of several nanoseconds. It is also interesting to note that a similar blue PL with a nanosecond decay time can be found in other nanostructured forms of silica and silicon, including oxidized porous silicon, mesoporous MCM-41 silica, and a natural hydrated form of silica, namely, opal . It is hence probable that the blue PL from these Si- and SiO 2 -based nanostructured materials originates from similar emission centers; however, the structural origin of the blue PL emission still remains to be solved.…”

Section: Introductionmentioning

confidence: 82%

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Influence of Thermal Treatments on the Photoluminescence Characteristics of Nanometer-Sized Amorphous Silica Particles

et al. 2007

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We have studied the photoluminescence (PL) characteristics of nanometer-sized amorphous silica particles after appropriate annealing in air and in vacuum. A broad visible PL band peaking at ∼450 nm, which is characterized by a nonexponential decay in the order of nanoseconds, has been found to develop when the samples are heat-treated in air. On the other hand, the vacuum-heated samples do not show such an increase in PL in the visible region but instead show a development of PL in the near-ultraviolet region. The different PL characteristics observed between the air- and vacuum-heated samples are discussed in terms of the different dehydroxylation reactions in air and in vacuum. Possible models of the respective emission centers are presented on the basis of the density functional theory calculations.

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Section: Resultssupporting

confidence: 60%

Section: Introductionmentioning

confidence: 82%

Influence of Thermal Treatments on the Photoluminescence Characteristics of Nanometer-Sized Amorphous Silica Particles

et al. 2007

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“…An understanding of the optical properties of mesoporous siliceous materials is important for extending their range of applications in optical devices. The photoluminescence (PL) of mesoporous siliceous MCM-41 has been studied recently [10][11][12][13][14][15][16][17][18]. The red (1.8-2 eV) PL in MCM-41 has been commonly attributed to oxygen-related defects, the non-bridging oxygen hole centers (NBOHCs) [10][11][12].…”

mentioning

confidence: 99%

Effect of laser illumination on the blue-green luminescence from MCM-41 at room temperature

Lin¹,

Chang²,

Huang³

et al. 2008

J. Phys.: Condens. Matter

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The effect of laser illumination on the luminescent properties of MCM-41 was investigated by photoluminescence (PL) measurements. It was found that PL peak energy, PL intensity, and PL degradation of MCM-41 can be manipulated by controlling the laser illumination time. Laser illumination on MCM-41 gave at least a 2.5 times increase in PL intensity and an improvement in PL degrading phenomena. Possible mechanisms were proposed to explain our experimental results in a consistent way. The results presented here are expected to be useful for clarifying the nature of light emission from MCM-41 materials and to be of practical use for its possible applications in optical devices.

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“…A green luminescence peak is mainly attributed to the interaction of defects, such as nonbridged oxygen hole centers, E′ centers (Si • ) of self-trapped excitons, and doubly coordinated silicon centers. In the annealing process, the doubly coordinated silicon centers are produced from the E′ centers, with the transition from a triplet to a singlet state resulting in green light emission. , …”

Section: Resultsmentioning

confidence: 99%

“…In the annealing process, the doubly coordinated silicon centers are produced from the E′ centers, with the transition from a triplet to a singlet state resulting in green light emission. 46,47 The luminescence characteristics of the singly doped substrates are shown in Figure 5. The metal, Ga, Bi, In, or Sn, was attached to the substrate surface and annealed at 600 °C for 10 h. The luminescence intensity of the In-doped sample was the highest.…”

Section: Resultsmentioning

confidence: 99%

Unique and Excellent Paintable Liquid Metal for Fluorescent Displays

Duan

Zhao

Zhang

et al. 2022

ACS Appl. Mater. Interfaces

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A liquid metal (LM) generally has excellent electrical conductivity, thermal conductivity, flexibility, fluidity, and reflectivity. Innovative electronics using a LM to paint colorful fluorescent patterns may be applied to many important fields. Herein we propose, for the first time, the use of a LM to paint fluorescent patterns in the field of natural science. An LM containing a main-group metal (Ga50.25Bi8.28In28.2Sn13.27) is used to paint a uniform alloy film on a ceramic substrate. The painting is not restricted by any curved surface, shape, or size, which therefore gives the LM diverse adaptability. We have adopted the strategy of “painting–annealing–dealloying” through which LM can easily be diffused and doped into the substrate to produce various defects. Defects, my themselves or through their interactions, can produce different colors of emitted light. The primary fluorescence colors, such as purple, yellow, blue, and white, have been painted with the LM. Importantly, the brightness and color coordinates can be adjusted by changing the LM composition or annealing temperature, and intricate, delicate, colorful fluorescence patterns can be produced. Due to the unique painting form, colorful fluorescence, high stability, corrosion resistance, and low cost of the technique used for the LM, it can be used for displays, lighting panels, flexible electronic circuits, anticounterfeiting devices, and sensors.

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Decay dynamics of blue–green luminescence in meso-porous MCM-41 nanotubes

Cited by 11 publications

References 31 publications

Influence of Thermal Treatments on the Photoluminescence Characteristics of Nanometer-Sized Amorphous Silica Particles

Influence of Thermal Treatments on the Photoluminescence Characteristics of Nanometer-Sized Amorphous Silica Particles

Effect of laser illumination on the blue-green luminescence from MCM-41 at room temperature

Unique and Excellent Paintable Liquid Metal for Fluorescent Displays

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