Monte-Carlo simulation of upconversion processes in erbium-doped materials

Przhevuskii, A. K.; Никоноров, Н. В.

doi:10.1016/s0925-3467(02)00090-3

Cited by 17 publications

(6 citation statements)

References 13 publications

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“…W ETU ( t ) gradually decreases after the excitation was switched on ( t = 0 ms) and after the excitation was switched off ( t = 10 ms). These time-dependent trends of W ETU ( t ) are in good agreement with the results of Przhevuskii and Nikonorov who used the Monte Carlo method to simulate the macroscopic energy-transfer rates, which also verifies the validity of the present upconversion model. Figure d also shows a similar dependence of W ETU–∞ on θ as seen in Figure b.…”

Section: Comparison With Experimental Datasupporting

confidence: 90%

Upconversion Model for Directly Determining the Microscopic Energy-Transfer Parameters for β-NaYF₄:Er³⁺

Liu

Shi

2020

J. Phys. Chem. C

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Lanthanide-doped photon upconversion systems are widely used to convert two or more low-energy photons into one high-energy photon. Theoretical upconversion models are needed to further understand the upconversion luminescence dynamics and improve photonic systems. Existing macroscopic and microscopic models still have limitations when analyzing upconversion systems with finite energy migration (EM) or time-dependent energy-transfer (ET) rates. This paper presents a macroscopic energy-transfer model based on the ion-pair microscopic state probability in an upconversion system. The model uses the microscopic dynamic state probability of ion pairs to predict the time-dependent macroscopic energy-transfer rates. The model gives the intrinsic microscopic and macroscopic parameters for the energy-transfer rates for upconversion systems where the EM process may or may not be infinitely fast. The model is verified against experimental data for single-doped systems of β-NaYF4:Er3+. The emission decay curves of the β-NaYF4:Er3+ samples with various Er3+ dopant concentrations were experimentally measured when excited by a 1.5 μm pulsed laser to determine the microscopic resonant energy-transfer parameters and the macroscopic energy-transfer rate. This work provides a theoretical method to determine the microscopic intrinsic energy-transfer parameters of widely used upconversion luminescence systems.

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Section: Comparison With Experimental Datasupporting

confidence: 90%

Upconversion Model for Directly Determining the Microscopic Energy-Transfer Parameters for β-NaYF₄:Er³⁺

Liu

Shi

2020

J. Phys. Chem. C

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“…In addition, the probability of the energy transfer UC (ETU) also increases with the Er 3+ concentration because energy migration among Er 3+ ions ( 4 I 11/2 states) is more signicant. 25,26 The UC emission intensity exhibited super-quadratic relation on the Er 3+ concentration; this suggested that the ETU was the dominant process. 24 On the other hand, the absorbance was almost constant under the 1180 nm excitation (since Ni 2+ concentration was constant).…”

Section: Resultsmentioning

confidence: 98%

Effect of Ti compositions for efficiency enhancement of CaTiO₃:Er³⁺,Ni²⁺ broadband-sensitive upconverters

et al. 2017

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Improving the efficiency of upconversion (UC) materials is a hot topic in recent days due to the important applications of UC materials in photovoltaics, photonics devices, photocatalysts, sensors, biological imaging, and therapeutics. Recently, we have reported a broadband-sensitive UC emission in Ni 2+ , Er 3+ -codoped perovskites. However, the applications of these perovskites are limited due to their low conversion efficiency. Herein, we realized highly improved UC efficiency in the CaTiO 3 :Er 3+ ,Ni 2+ upconverter as compared to those of the previously reported CaZrO 3 and La(Ga,Sc)O 3 upconverters. Ti composition plays important roles in stabilizing divalent nickel (Ni 2+ ) in an octahedral coordination, which is the key point for sensitization to Er 3+ emitters. Furthermore, oxygen vacancies and consequently tetrahedral Ni 2+ ions, which kill the luminescence, are suppressed, and as a result, the UC emission intensity is dramatically increased.The 0.1 mole Ti-deficient sample with the (Ca 0.8 Er 0.10 Li 0.10 )(Ti 0.894 Ni 0.002 Nb 0.004 )O 2.8 composition exhibited the most intense broadband-sensitive UC emission, which was 264-fold stronger than that of the stoichiometric sample and more than 12 folds as compared to that of the previously reported CaZrO 3 :Er,Ni and La(Ga,Sc)O 3 upconverters. The highest UC quantum yield of $2.53% was realized in the optimized CaTiO 3 :Er 3+ ,Ni 2+ upconverter under 1490 nm laser excitation of $1000 W m À2 . 952 288548; Tel: +81 956 717134 † Electronic supplementary information (ESI) available. See

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“…Finally, there are interesting advances in Monte Carlo modelling within this field, which can help to elucidate the emission mechanisms via the simulation of UC luminescence results. 114 …”

Section: Up-conversion Processmentioning

confidence: 99%

Nanocrystallisation in oxyfluoride systems: mechanisms of crystallisation and photonic properties

Pablos-Martín

Durán

Pascual

2012

International Materials Reviews

150

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Rare earth (RE) doped oxyfluoride glass ceramics possess interesting optical properties with applications in telecommunications and optoelectronics, such as solid state lasers, optical amplifiers, etc. These materials combine the transparency and mechanical and chemical resistance of aluminosilicate glasses with the low phonon energy and facile incorporation of RE ions in the fluoride crystals. The incorporation of RE ions in the crystalline phases enhances the laser emission intensity, a major property of these materials. Transparency is achieved when crystal size is in the nanometric scale, usually below 40 nm, which avoids light scattering. A strict control of the nucleation and crystal growth processes is therefore necessary which requires a deep knowledge of the crystallisation mechanisms. The great activity and publications in this field in the last decades merit a review providing a comparative study of the different nanoglass ceramic systems, their structural and optical characterisation and their main properties and applications. This is the objective of this review paper which includes 232 references. A general discussion on glass nucleation and crystallisation theories and more relevant crystallisation parameters and characterisation techniques are put forward in the first section of the review, focused on nanocrystallisation processes in oxyfluoride systems. In the second section, the principal RE doped glass ceramics are presented. After a general introduction about the luminescence processes, including up-and down-conversion, the behaviour of RE elements in glasses and crystals are discussed. Glass ceramic compositions have been divided as follows: glass ceramics with a glass composition following Wang and Ohwaki's oxyfluoride glass ceramic, 1 ; and glass ceramics with different matrix compositions, arranged by crystalline phases. Relevant properties, mainly optical and laser, are described in each system along with the most relevant applications of these materials.

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Monte-Carlo simulation of upconversion processes in erbium-doped materials

Cited by 17 publications

References 13 publications

Upconversion Model for Directly Determining the Microscopic Energy-Transfer Parameters for β-NaYF₄:Er³⁺

Upconversion Model for Directly Determining the Microscopic Energy-Transfer Parameters for β-NaYF₄:Er³⁺

Effect of Ti compositions for efficiency enhancement of CaTiO₃:Er³⁺,Ni²⁺ broadband-sensitive upconverters

Nanocrystallisation in oxyfluoride systems: mechanisms of crystallisation and photonic properties

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Monte-Carlo simulation of upconversion processes in erbium-doped materials

Cited by 17 publications

References 13 publications

Upconversion Model for Directly Determining the Microscopic Energy-Transfer Parameters for β-NaYF4:Er3+

Upconversion Model for Directly Determining the Microscopic Energy-Transfer Parameters for β-NaYF4:Er3+

Effect of Ti compositions for efficiency enhancement of CaTiO3:Er3+,Ni2+ broadband-sensitive upconverters

Nanocrystallisation in oxyfluoride systems: mechanisms of crystallisation and photonic properties

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Upconversion Model for Directly Determining the Microscopic Energy-Transfer Parameters for β-NaYF₄:Er³⁺

Upconversion Model for Directly Determining the Microscopic Energy-Transfer Parameters for β-NaYF₄:Er³⁺

Effect of Ti compositions for efficiency enhancement of CaTiO₃:Er³⁺,Ni²⁺ broadband-sensitive upconverters