Enhanced 2.0 μm Emission and Lowered Upconversion Emission in Fluorogermanate Glass‐Ceramic Containing LaF₃:Ho³⁺/Yb³⁺ by Codoping Ce³⁺ Ions

Abstract

Intense 2.0 μm emission of Ho3+ has been achieved through Yb3+ sensitization in fluorogermanate glass‐ceramic (GC) containing LaF3 pumped with 980 nm laser diode (LD). The observation of concurrent emissions at 538, 650, and 1192 nm points to the additional deexcitation routes based on infrared‐to‐visible upconversion processes and Ho3+:5I6 → 5I8 radiative transition. Comparative investigations of photoluminescent spectra and decay curves have indicated the effective role of Ce3+ ions in enhancing the 2.0 μm fluorescence along with suppressing the occurrence of these concurrent emissions. This would offer a promising approach to develop compact and efficient 2.0‐μm laser systems.

Improved Up-Conversion Luminescence from Er3+:LaF3 Nanocrystals Embedded in Oxyfluoride Glass Ceramics via Simultaneous Triwavelength Excitation

“…[17][18] Compared to other UC materials, the GCs containing LaF 3 :Er 3+ nanocrystals possess the advantages: lower phonon energy, higher chemical durability and mechanical strength, more intense UC luminescence, weaker light scattering as well as better-matched refractive index. [19][20][21][22] Moreover, UC luminescence properties, mechanisms and applications of the GCs upon simultaneous tri-wavelength excitation have rarely been reported to our knowledge. Here, we studied the UC luminescence properties of the germanate oxyfluoride GCs containing LaF 3 :Er 3+ nanocrystals upon simultaneous tri-wavelength NIR excitation.…”

“…In this work, we focused on the UC luminescence properties, mechanisms, and applications of germanate oxyfluoride glass ceramics (GCs) containing LaF 3 :Er 3+ nanocrystals upon simultaneous triwavelength NIR excitation. In most RE 3+ , Er 3+ is regarded as the most efficient ion for UC, which is attributed to its abundant energy cascades of 4f–4f transitions and larger NIR absorption cross section. , Compared to other UC materials, the GCs containing LaF 3 :Er 3+ nanocrystals possess the following advantages: lower phonon energy, higher chemical durability and mechanical strength, more intense UC luminescence, weaker light scattering, and better-matched refractive index. − Moreover, UC luminescence properties, mechanisms, and applications of the GCs upon simultaneous triwavelength excitation have rarely been reported to our knowledge. Here, we studied the UC luminescence properties of the germanate oxyfluoride GCs containing LaF 3 :Er 3+ nanocrystals upon simultaneous triwavelength NIR excitation.…”

The effects of Er3+ ion concentration on 2.0-μm emission performance in Ho3+/Tm3+ co-doped Na5Y9F32 single crystal under 800-nm excitation*

“…Moreover, Ho 3+ ion generally has a higher emission cross section and a longer lifetime of higher laser energy levels compared to Tm 3+ ion, and these features are conducive to low-threshold and efficient laser operation. [10,11] However, there is still a tough task due to the lack of suitable absorption bands for Ho 3+ ion that cannot directly absorb the most common commercial laser diodes at the pumping beam of 800 nm or 980 nm. [12] Therefore, some corresponding sensitizers such as Er 3+ , Tm 3+ , and Yb 3+ ions are taken into consideration to absorb pumping energy effectively due to they have strong absorption band near 800-nm wavelength (Er 3+ or Tm 3+ ion) and near 980-nm wavelength (Er 3+ or Yb 3+ ion).…”

Elaboration, Structure, and Intense Upconversion in Transparent KYb2F7:Ho3+ Glass‐Ceramics

“…The past decades have witnessed the blossom of rare‐earth (RE) ions doped upconversion materials due to their practical applications in all‐solid compact lasers, color displays, upconversion phosphors, photovoltaic devices, and biomedical imaging . RE ions‐doped fluoride‐nanocrystals‐based transparent oxyfluoride glass‐ceramics, new type of transparent hosts for RE ions doping, are considered as promising upconversion materials in virtue of the fact that they combine the advantages of superior chemical and mechanical stability of oxide glasses and low phonon energy environment of fluoride nanocrystals . Such materials are generated through controlled nucleation and crystallization from precursor glasses by thermal treatment.…”