Temperature-, power-, and concentration-dependent two and three photon upconversion in Er<sup>3+</sup>/Yb<sup>3+</sup> co-doped lanthanum ortho-niobate phosphors

Nascimento, João Paulo Costa do; Sales, A. J. M.; Sousa, D. G.; Silva, M. A. S. da; Moreira, S. G. C.; Pavani, K.; Soares, M.J.; Graça, M.P.F.; Kumar, Jitendra; Sombra, A. S. B.

doi:10.1039/c6ra12941b

Cited by 40 publications

(22 citation statements)

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“…83 Furthermore, the band at 807 cm −1 , ascribed to the symmetric stretching of the Nb–O bonds in the NbO 4 3− tetrahedra, is associated with the highest phonon energy, thereby making the host favorable for doping with lanthanide ions. 81,82 In our work, since all the samples exhibit a mixture of La 3 NbO 7 and LaNbO 4 phases, the vibrational modes of both crystalline phases and also some of the bands could be overlapped between the vibrational modes of both crystalline phases.…”

Section: Resultsmentioning

confidence: 97%

Red and near-infrared emitting phosphors based on Eu³⁺- or Nd³⁺-doped lanthanum niobates prepared by the sol–gel route

et al. 2022

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Section: Resultsmentioning

confidence: 97%

Red and near-infrared emitting phosphors based on Eu³⁺- or Nd³⁺-doped lanthanum niobates prepared by the sol–gel route

et al. 2022

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“…As was previously reported for both RENbO 4 and REVO 4 , the vibrational modes of these structures can be divided into the one being associated with the vibration of RE cation and niobium/vanadium tetrahedra. [24][25][26][27] The primitive unit cell in the fergusonite structure (space group I2/a, C2 h) contains two formula units, giving rise to 36 vibrational modes. Normal modes at the center of the Brillouin zone might be classified according to the subsequent irreducible representations: Γ = 8A g + 8A u + 10B g + 10B u One A u and two B g modes are acoustic modes.…”

Section: Resultsmentioning

confidence: 99%

Vibrational Properties of LaNb_0.8M_0.2O_4‐δ (M=As, Sb, V, and Ta)

et al. 2022

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LaNb0.8M0.2O4‐δ (where M=As, Sb, V, and Ta) oxides with pentavalent elements of different ionic sizes were synthesized by a solid‐state reaction method. The vibrational properties of these oxides have been investigated. These studies revealed that the substituent element influences both Debye temperature value as well as the Raman active vibrational modes. Additionally, the low‐temperature vibrational properties of LaNb0.8Sb0.2O4‐δ have been determined to show the phase transition occurrence at 260 K which is lower than previously reported.

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“…For the UCL mechanism, the UCL intensity (I) is proportional to the n th of the infrared excitation power ( P ). Therefore, the number of absorption photons ( n ) can be obtained by the I ∝ P n equation . Figure A presents the green and red logarithmic UCL intensity as a function of logarithmic excitation power.…”

Section: Resultsmentioning

confidence: 99%

Splitting upconversion emission and phonon‐assisted population inversion of Ba₂Y(BO₃)₂Cl:Yb³⁺, Er³⁺ phosphor

Huang

Yang

et al. 2017

J Am Ceram Soc

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Upconversion (UC) peak of 4 S 3/2 ? 4 I 15/2 transition of Er 3+ is close to that of 2 H 11/2 ? 4 I 15/2 transition. The UC emission splitting of Er 3+ caused by coordination fields of host results in that it is difficult to confirm which transitions ( 4 S 3/2 ? 4 I 15/2 or 2 H 11/2 ? 4 I 15/2 ) are responsible for the splitting UC emission peaks. In this work, the UC luminescence peaks located at 524, 540, 551, 565, 662, 677, and 683 nm were observed in the Ba 2 Y(BO 3 ) 2 Cl:Yb 3+ , Er 3+ phosphor upon the 980 nm excitation. The 524 and 540 nm UC emissions intensity were increased, while the 551 and 565 nm UC emissions intensity were decreased with the temperature increasing from 323 to 573 K, which is attributed to the phononassisted population inversion from the 4 S 3/2 to 2 H 11/2 level. The temperature dependence of UC emission spectra demonstrated that the 524 and 540 nm UC emissions are from 2 H 11/2 ? 4 I 15/2 transition, and 551 and 565 nm UC emissions are from the 4 S 3/2 ? 4 I 15/2 transition. Temperature sensing property was characterized by the UC intensity ratio of the 2 H 11/2 ? 4 I 15/2 transition to 4 S 3/2 ? 4 I 15/2 transition. The Ba 2 Y(BO 3 ) 2 Cl:Yb 3+ ,Er 3+ phosphor has potential application as the non-contact temperature sensor.

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Temperature-, power-, and concentration-dependent two and three photon upconversion in Er³⁺/Yb³⁺ co-doped lanthanum ortho-niobate phosphors

Abstract: Variation of two and three photon upconversion band intensities in LNO:Er1%–Yb7.5% phosphor with temperature.

Cited by 40 publications

References 40 publications

Red and near-infrared emitting phosphors based on Eu³⁺- or Nd³⁺-doped lanthanum niobates prepared by the sol–gel route

Red and near-infrared emitting phosphors based on Eu³⁺- or Nd³⁺-doped lanthanum niobates prepared by the sol–gel route

Vibrational Properties of LaNb_0.8M_0.2O_4‐δ (M=As, Sb, V, and Ta)

Splitting upconversion emission and phonon‐assisted population inversion of Ba₂Y(BO₃)₂Cl:Yb³⁺, Er³⁺ phosphor

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Temperature-, power-, and concentration-dependent two and three photon upconversion in Er3+/Yb3+ co-doped lanthanum ortho-niobate phosphors

Abstract: Variation of two and three photon upconversion band intensities in LNO:Er1%–Yb7.5% phosphor with temperature.

Cited by 40 publications

References 40 publications

Red and near-infrared emitting phosphors based on Eu3+- or Nd3+-doped lanthanum niobates prepared by the sol–gel route

Red and near-infrared emitting phosphors based on Eu3+- or Nd3+-doped lanthanum niobates prepared by the sol–gel route

Vibrational Properties of LaNb0.8M0.2O4‐δ (M=As, Sb, V, and Ta)

Splitting upconversion emission and phonon‐assisted population inversion of Ba2Y(BO3)2Cl:Yb3+, Er3+ phosphor

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Temperature-, power-, and concentration-dependent two and three photon upconversion in Er³⁺/Yb³⁺ co-doped lanthanum ortho-niobate phosphors

Red and near-infrared emitting phosphors based on Eu³⁺- or Nd³⁺-doped lanthanum niobates prepared by the sol–gel route

Red and near-infrared emitting phosphors based on Eu³⁺- or Nd³⁺-doped lanthanum niobates prepared by the sol–gel route

Vibrational Properties of LaNb_0.8M_0.2O_4‐δ (M=As, Sb, V, and Ta)

Splitting upconversion emission and phonon‐assisted population inversion of Ba₂Y(BO₃)₂Cl:Yb³⁺, Er³⁺ phosphor