- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Enhancement of Emission Intensity in Dy <sup>3+</sup> -Doped ZnO/ZnF <sub/>2</sub> Phosphoborate Glasses for W-LED Materials
摘要： Presently, white light emitting diodes (W-LEDs) were be used to substitute for conventional incandescent and fluorescent lamps due to their advantages; thus, it gets attention to create Dy3+-doped zinc phosphoborate glasses for enhancing better lightness. In this research, the replacing of ZnO by ZnF2 in 49B2O3:30P2O5:(20-x)ZnO:xZnF2:1Dy2O3 glasses, 0 ≤ x ≤ 20 mol% were prepared by melt quenching method and investigated through optical absorption and photoluminescence properties. The absorption results can be used for calculating the Judd-Ofelt (JO) intensity parameters (Ωλ, λ = 2, 4 and 6) and led to predicting the stimulated emission in present glasses. The trend of JO parameters is found to be Ω2 > Ω4 > Ω6 for all glasses. Nevertheless, replacing of ZnF2 does not affect position and intensity of optical absorption of Dy3+-doped glasses, whereas the observed blue (481 nm), yellow (573 nm) and red (662 and 752 nm) emission intensities of photoluminescence spectra rise with ZnF2 contents; the emission intensity at 573 nm for 20ZnF2 show the highest and was higher than 20ZnO around 1.6 times. The emission color of Dy3+-doped zinc phosphoborate glasses has been evaluated with CIE 1931 chromaticity diagram. The results revealed that all glasses emit white light. Hence, these glasses may be suitable candidate for using in W-LED and lighting materials.
关键词： optical absorption,Judd-Ofelt parameters,photoluminescence,ZnF2,W-LEDs,zinc phosphoborate glasses,Dy3+-doped
更新于2025-09-19 17:13:59
-
Tunable passively Q-switched Dy <sup>3+</sup> -doped fiber laser from 271 to 308??μm using PbS nanoparticles
摘要： We present the first widely tunable passively Q-switched Dy3+-doped ZBLAN fiber laser around 3 μm pumped at 1.1 μm using PbS nanoparticles as the saturable absorber (SA) to our knowledge. At 2.87 μm, the modulation depth and saturation intensity of the SA were measured to be 12.5% and 1.10 MW∕cm2, respectively. Stable Q-switching was achieved over a wavelength range of 2.71–3.08 μm (～370 nm), which is a record tuning range from a pulsed rare-earth-doped fiber laser, to our knowledge. A maximum output power of 252.7 mW was obtained, with a pulse energy of 1.51 μJ, a pulse width of 795 ns, and a repetition rate of 166.8 kHz. This demonstration implies that Dy3+ is a promising gain medium for tunable pulsed sources in the 3 μm band and shows for the first time, to the best of our knowledge, the potential of PbS as a mid-infrared SA.
关键词： Dy3+-doped ZBLAN fiber laser,passively Q-switched,PbS nanoparticles,mid-infrared,tunable
更新于2025-09-16 10:30:52
-
White light-emitting Dy <sup>3+</sup> -doped transparent chloroborosilicate glass: synthesis and optical properties
摘要： Dy3+-doped chloroborosilicate glasses with the composition 35.7SiO2-25.5B2O3-17BaO-3.4K2O-3.4Al2O3-15BaCl2 (mol%) were prepared using melt quenching technique. The glass transition temperature (Tg) was ~610°C. In UV-Vis-NIR absorption spectra characteristic absorption bands of Dy3+ appeared at 322, 347, 364, 388, 795 and 880 nm due to spectral transitions from the 6H15/2 level to various higher levels of Dy3+ ion. The excitation spectrum was recorded at within 200–550 nm by monitoring emissions at 576 nm. The excitation bands at 392, 428, 453 and 472 nm were attributed to the 6H15/2 → 4I13/2, 4G11/2, 4I15/2 and 4F9/2 transitions, respectively. Prominent emission bands were observed at wavelengths of 484, 576, 664 and 754 nm when excited at 447 nm. The bands correspond to the transitions 4F9/2→6H15/2, 4F9/2 → 6H13/2, 4F9/2 → 6H11/2, and 4F9/2 → 6H9/2 6F11/2 respectively. The emitted light from all the samples were found to be white. Their colour coordinates lie within the white range. The sample containing 0.5 wt% Dy2O3 emitted white light with the colour coordinates x=0.351, y=0.335, which are the very closest to pure white light and whose colour temperature of 4716 K is similar to daylight. Such white light-emitting transparent glasses promise to be enormously useful for various photonic applications.
关键词： white light generation,chloroborosilicate glass,Dy3+-doped glass,photoluminescence,absorption spectra
更新于2025-09-09 09:28:46