Selective UV Detector as a Combination of Waveguide Structures of Eu3+-Doped Zinc Borate Glasses with Si Photodiode

Abstract

Subject classification: 78.20.Ci; 78.55.Hx; S10.15 Selective, low cost ultraviolet detectors with a sensitivity of up to 3 mA/W in the UVC energy range were fabricated by means of Eu 3+ -doped zinc borate glass (ZBG) fibers and Si-photodiodes. Europium-doped ZBG shows highly efficient emission (613 nm) from Eu 3+ by irradiation with high-energy UV light. The Eu 3+ -doped ZBG fiber converts the incoming UV light into visible light of 613 nm and guides it to a silicon photodiode. Eu 3+ -doped ZBG fibers Zn x B 1--x O 1.5--0.5x of varying composition (x = 0.33-0.52) were produced by the melt spinning method from glass melt in air atmosphere. The fibers were then connected to the silicon photodiode surface. The wavelength of maximum sensitivity of our detector is in the far ultraviolet and can be varied between 240 and 270 nm by changing the Zn content in the glass matrix.

Synthesis and spectroscopic studies of Fe3+-doped zinc borate powder

“…For a d 5 configuration the transitions are spin forbidden and they appear with less intensity. The transitions 6 A 1g (S) ? 4 T 1g (G) and 6 A 1g (S) ?…”

“…The transitions 6 A 1g (S) ? 4 T 1g (G) and 6 A 1g (S) ? 4 T 2g (G) depend on the crystal field strength Dq and give rise to broad bands.…”

“…4 T 2g (G) depend on the crystal field strength Dq and give rise to broad bands. For the transitions like 6 A 1g (S) ? 4 E g (G), which are independent of Dq the bands would be less broadened [19].…”

“…These BO 3 and BO 4 groups can further link together via common oxygen atoms to form various polyborate anions. Zinc borate has long been the subject of significant research for various applications [2][3][4][5][6][7][8][9][10][11]. Borate salt containing zinc has been produced by the reaction of zinc oxide and boric acid at proper temperature and mixing conditions.…”

Determination of the electric charge distribution in an amorphous material. I. Choice of the theoretical model and correlation with XP spectra

“…The interest in such glassy matrix derives form the possible technical application that this material may offer. In fact, zinc-borate is one of those materials in which the introduction of rare earth ions, may result in material properties of interest for photonics [22][23][24] and for the possible applications in the field of telecommunication and optoelectronics [25][26][27]. Zinc and boron oxide can organize in markedly different networks.…”