Violet-green excitation for NIR luminescence of Yb^3+ ions in Bi_2O_3-B_2O_3-SiO_2-Ga_2O_3 glasses

Abstract

60Bi(2)O(3)-20B(2)O(3)-10SiO(2)-10Ga(2)O(3) glasses doped with 1-9 mol% Yb(2)O(3) were prepared and investigated mainly on their violet-green excitation for the typical NIR emission of Yb(3+), generally excited in the NIR. Two violet excitation bands at 365 nm and 405 nm are related to Yb(2+) and Bi(3+). 465 nm excitation band and 480 nm absorption band in the blue-green are assigned to Bi(0) metal nanoparticles/grains. Yb-content-dependence of the excitation and absorption means that Bi(0) is the reduced product of Bi(3+), but greatly competed by the redox reaction of Yb(2+) ↔ Yb(3+). It is proved that the violet-green excitations result in the NIR emission of Yb(3+). On the energy transfer, the virtual level of Yb(3+)-Yb(3+) as well as Bi(0) dimers probably plays an important role. An effective and controllable way is suggested to achieve nano-optical applications by Bi(0) metal nanoparticles/grains and Yb(3+).

Interaction of Nd dopants with broadband emission centers in Bi2O3–B2O3glass: local energy balance and its influence on optical properties

“…The sample was mounted on a temperature-controllable holder with a pinhole for the transmittance measurement. Light from an IR-excluded light source (Asahi Spectra, MAX-303) that penetrated a sample and a monochromator (Japans spectroscopic, Co., Ltd., CT-25CS) was detected with In figure 3(a), the absorption at ~2.8 eV corresponds to the absorption edge of the bismuthate glass [25], and the peak at lower energy around 2.5 eV indicates the absorption of the IEC in the bismuthate glass, as described above [14][15][16][17][18][19][20]. At room temperature, the peak was too weak to be distinguished from the Urback tail [26], indicating that the range of T s represents an initial stage of O-deficient structure formation.…”

“…Bi-doped glasses, are known to be super broadband IR emitters [12,13]: Bi-containing glasses have their own intrinsic emission centers (IECs) for the broadband emission. The origin of IECs has been investigated by many groups [14][15][16][17][18][19][20]. Although IEC absorption and emission properties vary with the fabrication process, glass composition, and dopants, IECs are suspected to originate from simple oxygen (O)-deficient structures, such as Bi metal clusters (Bi agglomeration), Bi [14,18], and BiO [20].…”

Bismuth Nanoparticles with “Light” Property Served as a Multifunctional Probe for X-ray Computed Tomography and Fluorescence Imaging

“…On the other hand, arising from the abundant energy lever configuration, the fluorescence property of bismuth based materials is also widely discussed in the optics and materials fields. − Especially, the luminescence phenomenon makes it possible to act as a fluorescence imaging probe. − Compared with the X-ray CT, the fluorescence imaging causes little harm to the human body and could be conducted multiple times within a short time, which is more preferred to the demand for tracing of tumor metastasis. − Due to the complementary advantages of each technology, the multimode imaging can improve the diagnosis accuracy. − However, the large density of the Bi also makes it hard to disperse in the hydrophilic solvent, which is the main challenge for its bioapplication. From this concern, tailoring materials to nanoscale with small size such as nanoparticles, quantum dots, and nanoclusters is regarded as an effective way.…”

Novel Synthesis of Low Hydroxyl Content Yb3+‐Doped Fluorophosphate Glasses with Long Fluorescence Lifetimes

“…Meanwhile, the Yb 3+ ion has simpler energy level and larger absorption cross‐section than other rare‐earth ions around ~980 nm region, which enables efficient pumping by commercial diode lasers . Therefore, Yb 3+ ‐doped or codoped FP glass has attracted more and more attention for applications in planar waveguide amplifiers, optical amplifiers for telecommunications, near‐infrared laser, solid‐state frequency up‐converters, and microcrystal‐glass composites …”

“…[4][5][6] Therefore, Yb 3+ -doped or codoped FP glass has attracted more and more attention for applications in planar waveguide amplifiers, optical amplifiers for telecommunications, near-infrared laser, solid-state frequency up-converters, and microcrystal-glass composites. [7][8][9][10][11] In rare-earth ions-doped glasses, the absorption losses of hydroxyl groups (-OH) still stand as a major problem hindering the glasses applications as gain medium and infrared transmission materials. [12][13][14] The vibration frequency of -OH groups falls in the range from 2700 to 3500 cm À1 , which are much larger than the phonon energies of FP glass host.…”