An efficient perovskite-type Rb2CaPO4F:Eu2+ phosphor with high brightness towards closing the cyan gap
| Autor: | Jian-Feng Sun, Rong Zhang |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Materials science
business.industry Mechanical Engineering Cyan Metals and Alloys Phosphor 02 engineering and technology Electronic structure Green-light 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Mechanics of Materials Materials Chemistry Optoelectronics Quantum efficiency Orthorhombic crystal system 0210 nano-technology Luminescence business Perovskite (structure) |
| Zdroj: | Journal of Alloys and Compounds. 872:159698 |
| ISSN: | 0925-8388 |
| DOI: | 10.1016/j.jallcom.2021.159698 |
| Popis: | Along with the development of versatile trichromatic phosphors, the phosphors bridging the cyan gap between blue and green light have been an ongoing focus in simulating the full-visible-spectrum luminescence to satisfy the daily illuminating demands. Herein, an intriguing cyan-emitting phosphor Rb2CaPO4F:Eu2+ belonging to the perovskite-type structural prototype was first time synthesized via the solid-state reaction. Structural analysis indicated that the typical Rb2Ca0.90PO4F:0.10Eu2+ phosphor crystallizes in the orthorhombic structure with the space group of Pnma (62), and its cell parameters are equal to a = 12.913(5) A, b = 5.989(4) A, c = 7.440(1) A, and V = 575.44(8) A3. The fluorine-centered [FRb4Ca2] octahedra interconnect with each other by sharing faces to build the one-dimensional perovskite-structure corrugated chains, which further connect with the [PO4] tetrahedra to establish the structural framework of Rb2CaPO4F host. The electronic structure of Rb2CaPO4F matrix was studied by the first-principle calculation on the basis of the density functional theory, revealing an appropriate direct band of 4.76 eV. Pumped with the near-ultraviolet light, Rb2CaPO4F:Eu2+ phosphor displayed a bright cyan emission covering from 400 to 600 nm with a broad FWHM of 142 nm. According to the Dexter theory, the concentration quenching mechanism of Eu2+-activated Rb2CaPO4F phosphor was classified as the dipole-dipole interaction. The Rb2CaPO4F:Eu2+ phosphor not only exhibits a good thermal stability (I443 K/I298 K = 70%), but possesses a satisfactory internal quantum efficiency of 68% which is superior to most of the previously reported cyan-emitting phosphors. Consequently, it turns out that our perovskite-type Rb2CaPO4F:Eu2+ phosphor can be considered as a promising candidate to fill the cyan gap toward the full-visible-spectrum light. The present work also demonstrates a great possibility for exploring the novel phosphors inspired by the mineral-type structural prototypes. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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