Concentration and temperature dependent luminescence properties of Gd 2 MoO 6 :Eu 3+ and white light generation from g-C 3 N 4 /Gd 2 MoO 6 :Eu 3+ composite phosphor
| Autor: | Bing Han, Liang Zhao, Pan Huang, Juxin Yu, Jie Zhang |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
business.industry
Chemistry Analytical chemistry Phosphor 02 engineering and technology Activation energy 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences law.invention Ion Inorganic Chemistry Solid-state lighting law Phase (matter) Materials Chemistry Optoelectronics Physical and Theoretical Chemistry Electric dipole transition 0210 nano-technology business Luminescence Monoclinic crystal system |
| Zdroj: | Polyhedron. 133:398-403 |
| ISSN: | 0277-5387 |
| DOI: | 10.1016/j.poly.2017.05.058 |
| Popis: | The design and discovery of novel near-ultraviolet excitable phosphors has become a hot topic in academic research and practical applications, such as white light-emitting diodes for solid state lighting. The present work firstly reports the concentration/temperature dependent luminescence properties of the red emitting phosphor Gd2MoO6:Eu3+, synthesized by a typical solid state method. The as-prepared phosphor possesses a single monoclinic phase, as determined from XRD results. Upon excitation with near-ultraviolet light, the Gd2MoO6:Eu3+ phosphor exhibits a characteristic red emission corresponding to the 4f-4f transitions of the Eu3+ ions, in which the main electric dipole transition is 5D0 → 7F2. In addition, the concentration quenching mechanism and the activation energy for thermal quenching of the Eu3+ ions in Gd2MoO6 host was also investigated in detail. Furthermore, a series of novel near-ultraviolet excitable emitting-color tunable composite phosphors consisted of graphitic-phase nitrogen carbon (g-C3N4) and Gd2MoO6:Eu3+ is reported herein. It is interesting that white light emission is veritably generated by compositing two luminescence materials at an appropriate weight ratio of g-C3N4 to Gd2MoO6:Eu3+. The combination of an n-UV LED chip with the composite g-C3N4/Gd2MoO6:Eu3+ phosphor produces white light with a CRI value of ∼80.1 and a CCT value of 4244 K. The obtained results indicate that the Gd2MoO6:Eu3+ and g-C3N4/Gd2MoO6:Eu3+ phosphors could be potential red and white emitting phosphors for application in white light-emitting diodes. |
| Databáze: | OpenAIRE |
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