Upconversion luminescence properties of three-dimensional ordered macroporous CeO2: Er3+, Yb3+

Wu, Haixiao; Yang, Zhengwen; Liao, Jiayan; Lai, Shenfeng; Qiu, Jianbei; Song, Zhiguo; Yang, Yong; Zhou, Dacheng; Yin, Zhaoyi

doi:10.1016/j.jallcom.2013.10.124

Cited by 22 publications

(14 citation statements)

References 18 publications

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“…Over the past decade, significant advances have occurred in the controlled modulation of spontaneous emission by photonic crystals. Key new developments in the exploitation of photonic crystals are compiled in Figure a–j . Early studies confirmed that spontaneous emission will be completely quenched when photons emit at a wavelength within the photonic bandgap of a 3D photonic crystal comprising light emitters in the lattice (Figure f).…”

Section: Introductionmentioning

confidence: 99%

Manipulating Luminescence of Light Emitters by Photonic Crystals

et al. 2018

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dispersion by semiconductor devices based on the electron energy bandgap-the forbidden energies separating allowed energy bands. An example of photonic crystals with simple periodic arrays formed from dielectric spheres is shown in Figure 1. According to Bragg's equation, [3] the wavelength of the photons scattered from the crystal lattice can be calculated by the following formula (Equation (1)where d is the diameter of the sphere, m is the Bragg reflection order, and θ is the angle between the normal and incident light. The value of n a is defined as the weighted sum of sphere portion refractive indices and the gap portion (Equation (2)) [3] ∑ φ = n n i i a 2 2(2)where n is the refractive index of different components inside photonic crystals and φ i is the volume fraction of each i portion. For the close-packed structure, φ i of the sphere portion is 0.74. Photon propagation can be precisely controlled by designing a photonic crystal with a specific photonic bandgap. Hence, a future trend in the design of photonic crystals may lie in the modification and realization of spontaneous emission by light emitters integrated with these crystals. [4][5][6] Spontaneous emission refers to an optical process in which a quantum mechanical system in an excited state returns to a lower-energy or ground state and releases energy in the form of a photon. The quantum system could be an atom, molecule or nanocrystal. The photoluminescence (PL) produced by spontaneous emission plays a crucial role in conventional modern technologies used in daily lives, such as television screens (cathode ray tubes), plasma display panels, and fluorescence tubes.While spontaneous emission has enabled the progress of several technologies, uncontrolled spontaneous emission can limit the performance of photonic devices in many applications. One such limitation in device performance in light-emitting diodes (LEDs) occurs when an excessive number of photons generated from spontaneous emission are confined or trapped within the device. This shortcoming is also observed in laser operation when photon emission fails to couple with lasing processes, resulting in energy loss and noise in the signal output. Consequently, precise control over the propagation of spontaneous emission is critical. Due to their ability to manipulate light The modulation of luminescence is essential because unwanted spontaneousemission modes have a negative effect on the performance of luminescencebased photonic devices. Photonic crystals are promising materials for the control of light emission because of the variation in the local density of optical modes within them. They have been widely investigated for the manipulation of the emission intensity and lifetime of light emitters. Several groups have achieved greatly enhanced emission by depositing emitters on the surface of photonic crystals. Herein, the different modulating effects of photonic crystal dimensions, light-emitter positions, photonic crystal structure type, and the refractive index of photonic crystal building bl...

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Section: Introductionmentioning

confidence: 99%

Manipulating Luminescence of Light Emitters by Photonic Crystals

et al. 2018

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“…These results are all attributed to the elimination of nonradiative relaxation assisted by high-energy phonons. Furthermore, the suppression of the population of the 4 I 13/2 state leads to a decrease in the relative intensities of the red-to-green emission [14,36].…”

Section: Near Infrared Downconversion Propertiesmentioning

confidence: 99%

Femtosecond-pulse laser-ablation-induced synthesis and improved emission properties of ultrafine Y2O3:Er3+, Yb3+ nanoparticles with reduced nonradiative relaxation

Zheng

Yang

Zhang

et al. 2015

Journal of Alloys and Compounds

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“…Among the rare earth family, Er 3+ has abundant energy levels and higher upconversion luminescence efficiency, making it as a excellent candidate for the conversion from visible to UV light (Pickering et al, 2017). The Er 3+ can be easily doped into the crystal lattice of CeO 2 along with the production of oxygen vacancy since the ion radius of Ce 4+ is very close to Er 3+ (Wu et al, 2014). Meanwhile, CeO 2 has high chemical stability and low phonon energy, making it suitable as matrix materials in upconversion.…”

Section: Introductionmentioning

confidence: 99%

Z-Scheme Photocatalyst Constructed by Natural Attapulgite and Upconversion Rare Earth Materials for Desulfurization

Zhang

et al. 2018

Front. Chem.

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The Er3+:CeO2/ATP (attapulgite) nanocomposites were prepared by a facile precipitation method. The samples were characterized by various measurements. XRD and TEM showed that Er3+:CeO2 nanoparticles were well-crystallized and loaded on the surface of ATP. The visible light was converted into ultraviolet light by Er3+:CeO2 as evidenced by upconversion photoluminance (PL) analysis. The mass ratio of Er3+:CeO2 to ATP on the desulfurization efficiency was investigated. Results showed that the desulfurization rate reached 87% under 4 h visible light irradiation when the mass ratio was 4:10. The mechanism was put forward as follows. Er3+:CeO2 and ATP formed Z-scheme heterostructure intermediated by oxygen vacancy, leading to the enhanced separation of photogenerated charges and preservation of high oxidation-reduction potential, both of which favored for the generation of radicals to oxidize sulfur species.

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Upconversion luminescence properties of three-dimensional ordered macroporous CeO2: Er3+, Yb3+

Cited by 22 publications

References 18 publications

Manipulating Luminescence of Light Emitters by Photonic Crystals

Manipulating Luminescence of Light Emitters by Photonic Crystals

Femtosecond-pulse laser-ablation-induced synthesis and improved emission properties of ultrafine Y2O3:Er3+, Yb3+ nanoparticles with reduced nonradiative relaxation

Z-Scheme Photocatalyst Constructed by Natural Attapulgite and Upconversion Rare Earth Materials for Desulfurization

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