Four-photon upconversion induced by infrared diode laser excitation in rare-earth-ion-doped Y2O3 nanocrystals

Chen, G.Y.; Liu, Y.; Zhang, Zhiguo; Aghahadi, B.; Somesfalean, Gabriel; Sun, Qiu; Wang, F.P.

doi:10.1016/j.cplett.2007.09.078

Cited by 53 publications

(25 citation statements)

References 22 publications

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“…Most of the upconversion processes have been restricted to 4f N ! 4f N transitions, employing hosts such as b-NaYF 4 [136] and rare earth sesquioxides [137], which have relatively low phonon energies, together with tripositive lanthanide ions. Figure 11 shows a schematic upconversion process using 810 nm excitation, involving GSA/ESA and ETU, for CsCaI 3 :Tm 2+ , where the highest energy phonon energy is only $170 cm À1 [138].…”

Section: Photon Avalanchementioning

confidence: 99%

Lanthanide Luminescence in Solids

Tanner

2010

Springer Series on Fluorescence

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A tutorial introduction to the spectra of lanthanide ions is given. The chapter begins with a brief comparison of luminescence of lanthanide ions (Ln 3+ ) in the solid, liquid, and gas phases. Then a description of the importance of nonradiative versus radiative processes is made. The various types of transition of lanthanide ions encountered are then introduced: 4f N -4f N ; 4f N -4f NÀ1 5d; charge transfer; host band-to-band; and defect site or impurity transitions. Reference is briefly made to the spectra of dipositive ions. The luminescence of lanthanide ions in non-lanthanide hosts is examined, and the importance of locating the relative positions of Ln 3+ energy levels relative to the host band gap is stressed. Some of the various upconversion phenomena, including second harmonic generation, twophoton absorption, ground state/excited state absorption, energy transfer upconversion, and photon avalanche, are then described with reference to Ln 3+ and Ln 3+ -TM n+ (transition metal) systems. The experimental distinctions of which particular process is operative in a given system are explained by considering the power, concentration, and lifetime dependences, and the upconversion excitation spectrum. Some applications of lanthanide luminescence are briefly reviewed and a mention of the luminescence in nanomaterials is also included.

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Section: Photon Avalanchementioning

confidence: 99%

Lanthanide Luminescence in Solids

Tanner

2010

Springer Series on Fluorescence

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“…The mean particle diameter is about 10 nm and less than that of nanocrystals prepared by solegel method, which are shown in Ref. [25]. Fig.…”

Section: Preparation Of Y 2 O 3 :Er 3þ Yb 3þ Nanoparticles Using Somentioning

confidence: 95%

“…The solution was then dried at 120 C for 24 h until it was transformed into a black bulk, which was further calcined at 800 C for 2 h. Then, the powders were pressed to pellets using a pressure of 10 MPa that was applied for 90 s. The TEM micrograph of nanoparticles prepared using the same method has been present in Ref. [25]. The average diameter of these solegel nanoparticles was approximately 40 nm.…”

Section: Preparation Of Y 2 O 3 :Er 3þ Yb 3þ Nanoparticles Using Somentioning

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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“…A mixing upconversion excitation phenomenon of green fluorescence was observed, and the similar phenomenon was discovered and discussed only in high phonon-energy glasses and crystals before [29][30][31][32][33][34][35]. To further expose the characteristic of green light, the differentiation between 2 H 11/2 → 4 I 15/2 and 4 S 3/2 → 4 I 15/2 emission transitions was detailed investigated.…”

Section: Introductionmentioning

confidence: 94%