800 nm laser induced white light upconversion of Nd/Yb/Pr triply doped NaYF4 through a dual-sensitization strategy

Crystal growth, structure and optical properties of Pr3+-doped yttria-stabilized zirconia single crystals*

“…[5][6][7][8] In addition, the emission band of Pr 3+ includes RGB components, which in principle can emit white light with the aid of other ions. [9] Pr 3+ absorbs in the blue light region with a cross-section up to 10 −19 cm 2 , and energy absorbed in the blue region by Pr 3+ produces transitions at multiple wavelengths corresponding to blue-green to deep red light. The absorption peak near 450 nm corresponds to the output wavelength of an InGaN blue light diode (LD), and there is thus the possibility of using a blue LD as an absorption pump to achieve efficient green to deep red broadband spectral emission.…”

Lanthanide-Ion-Doping Effect on the Morphology and the Structure of NaYF4:Ln3+ Nanoparticles

“…Lanthanide-doped functional nanomaterials are widely studied due to their optical properties and broad application within such areas as the design of luminescent thermometers and photocatalysts, the development of sensors of biologically important substances and solar cells, single-molecule microscopy, solid-state lasers, and so on [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 ]. Such compounds allow making multifunctional materials through a combination of optical, magnetic, and other properties, which make them attractive and promising materials for theranostics.…”

Praseodymium-Doped Nanoparticles: Candidates for Near-Infrared-II Double- and Single-Band Nanothermometry

“…Moreover, the exploration of Pr adds to the spectral variety of commonly studied Ln 3+ ions, potentially offering new avenues for optical multiplexing applications . Yet, while the thermal response of the upconversion emission as well as UV–vis triggered NIR emission of Pr 3+ has been demonstrated, ,,,,, Pr 3+ -based nanothermometers that fully operate in the NIR spectral region (excitation and emission) have not been reported to date. This motivated us to develop the first NIR-NIR Pr 3+ -based nanoscale thermal sensor.…”

“…To date, different types of materials and molecules have been examined for the design of luminescence nanothermometers, including organic dyes, quantum dots, polymers, and lanthanide (Ln)-based molecules, molecular cluster-aggregates, and nanoparticles. − Among them, Ln-based nanoparticles (Ln-NPs) have been widely investigated due to their demonstrated excellent photostability, relatively low toxicity, and capability to emit light in the ultraviolet (UV), visible, and near-infrared (NIR) spectral range when excited with NIR light (e.g., 980 or 808 nm), so-called upconversion . Of particular interest for biomedical applications is their capability to emit light of wavelengths longer than 1000 nm under NIR excitation (downshifting), thus matching the so-called NIR biological transparency windows (NIR-I: 650–950 nm, NIR-II: 1000–1350 nm, NIR-III: 1450–1900 nm). , The most commonly used NIR-emitting Ln 3+ ions are Nd 3+ (NIR-I/II), Ho 3+ (NIR-II), Tm 3+ (NIR-I/II/III), and Er 3+ (NIR-III). − On the other hand, Pr 3+ is well-known for its visible photoluminescence under NIR or UV excitation, − though its NIR emission remains largely underexplored at the nanoscale. ,− For potential biological applications, the NIR-II emission centered at ca. 1300 nm, ascribed to the Pr 3+ 1 G 4 → 3 H 5 transition, is of interest given the limited overlap with the water absorption band with a maximum at 1400–1500 nm .…”