Person: ERDEM, MURAT
Loading...
Email Address
Birth Date
Research Projects
Organizational Units
Job Title
Last Name
ERDEM
First Name
MURAT
Name
3 results
Search Results
Now showing 1 - 3 of 3
Publication Metadata only Investigation of spectral output of Er3+ and Yb3+/Er3+ doped TeO2-ZnO-BaO glasses for photonic applications(ROYAL SOC CHEMISTRY, 2021) ESMER, KADİR; Dogan, Anil; Yildirim, Saniye Merve; Erdem, Murat; Esmer, Kadir; Eryurek, GonulEr3+ and Yb3+/Er3+ doped TeO2-ZnO-BaO glasses were synthesized using the melt quenching technique with two different Er3+ concentrations. The refractive index was calculated to be around 2.14 from the optical band gap energies of the glasses. Under 975 nm laser excitation, weak blue, strong green and red emissions were observed in the visible region, while broadband emission around 1530 nm was recorded in the near infrared region. The increase in red emission intensity as a result of energy transfer from Yb3+ ions to Er3+ ions in Yb3+/Er3+ co-doped glasses is clearly reflected in the change in color coordinates. The temperature sensing abilities of the glasses were determined from the intensity ratios of light emitted from thermally coupled energy levels (H-2(11/2) and S-4(3/2)) of Er3+ ions. The highest absolute sensitivity was determined as 0.0046 K-1 at 453 K for Er3+ doped glass and 0.0067 K-1 at 353 K for Yb3+/Er3+ co-doped glass. These results show that Er3+ and Yb3+/Er3+ doped TeO2-ZnO-BaO glasses are promising candidates for both lighting and optical temperature sensors.Publication Open Access Spectral investigation of Yb3+/Ho3+/Tm3+:Y2Si2O7 upconverting nanophosphors for the usage of temperature sensing(2023-02-28) ERDEM, MURAT; ESMER, KADİR; ERDEM M., ESMER K., Eryürek G.© 2023, Turkish Chemical Society. All rights reserved.Rare earth (Yb3+, Ho3+, Tm3+) yttrium disilicate phosphors were produced by sol-gel technique and heated at 1050 °C temperature. The sizes of the phosphors vary between 20-30 nm according to the images obtained from the Transmission Electron Microscope. The up-conversion (UC) emissions of the nanopowders were measured in the range of 500–900 nm wavelength under 950 nm laser excitation. A linear increase with power was observed in the emission intensity ratio depending on the laser excitation power. Using the FIR technique, the phosphor’s temperature was determined by the heating effect caused by the laser pump power. Due to the change in intensity ratio versus temperature, the temperature sensitivity at 428 K was calculated as 0.781x10-2K-1 and it was suggested that it can be used as a promising temperature sensor probe in photonic devices.Publication Metadata only Investigation of spectral properties of Er3+/Yb3+ CO-doped TeO2-B2O3-NbO5-ZnO-WO3-TiO2 glass systems(2022-10-04) ERDEM, MURAT; ESMER, KADİR; CANER T. F., Sümer I., Doğan A., ERDEM M., ESMER K., ERYÜREK G.