کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6465177 | 1422951 | 2017 | 11 صفحه PDF | دانلود رایگان |
- The optimal doping concentration for Er3+ ions in La2MoO6 host lattice was 2Â mol%.
- A green-emitting LED based on the resultant nanoparticle and NUV chip was fabricated.
- The maximum sensitivity for the synthesized nanoparticle was 0.0097Â Kâ1 at 463Â K.
- The sensitivity of the studied samples was dependent on the dopant concentration.
- The obtained nanoparticles possessed superior water resistance behavior.
Series of Er3+-activated La2MoO6 nanoparticles were prepared by a traditional sol-gel method. Under the excitation of 379Â nm, the resultant compounds revealed dazzling emissions that can be seen by naked eye. With the increment of Er3+ ion concentration, the emission intensity showed an upward tendency and reached its maximum value when the doping concentration was 2Â mol%. The critical distance was calculated to be 23.41Â Ã and the dipole-dipole took the domination in the concentration quenching mechanism. Furthermore, by means of a fluorescence intensity ratio technique, the temperature sensing performances of the synthesized samples in the temperature range of 303-463Â K were investigated based on the thermally coupled levels, 2H11/2 and 4S3/2, of Er3+ ions. It is found that the sensor sensitivity of Er3+-activated La2MoO6 nanoparticles can be greatly affected by the doping concentration and the maximum sensor sensitivity was determined to be about 0.0097Â Kâ1 at 463Â K. In addition, the prepared nanoparticles also exhibited splendid water resistance behaviors. These results demonstrate that the Er3+-activated La2MoO6 nanoparticles are promising candidates for simultaneous solid-state lighting and non-contact thermometry.
EL spectrum of the fabricated green-emitting LED device and sensor sensitivity as a function of temperature. Inset shows the digital images of the fabricated device as well as the schematic diagram for the fabrication of green-emitting LED device.94
Journal: Chemical Engineering Journal - Volume 327, 1 November 2017, Pages 109-119