| Autor: |
Li, M. M., Xiong, F. B., Yang, W. B., Cheng, Z. J., Ma, E. |
| Předmět: |
|
| Zdroj: |
Applied Physics A: Materials Science & Processing; Nov2024, Vol. 130 Issue 11, p1-11, 11p |
| Abstrakt: |
A serial of red-emitting MgMoO4: Eu3+ phosphors were synthesized via a high-temperature solid-phase approach. The effect of partially combined substitution of Mg2+-Mo6+-O2− with Ca2+-W6+-F− on the structure and luminescent properties of the MgMoO4: Eu3+ phosphor was thoroughly investigated. The crystal structure of the as-prepared MgMoO4: Eu3+ phosphor was not influenced by the partially combined Ca2+-W6+-F− substitution. Under the excitation of 394 nm, The MgMoO4: Eu3+ phosphor could emit bright red light centered approximately at 612 nm, corresponding to the 5D0 → 7F2 transition of Eu3+ and the optimal concentration of Eu3+ was about x = 0.10. After the partially combined Ca2+-W6+-F− substitution, the luminescence intensity of Eu3+ ions was approximately 1.94 times of the initial values owing to the alteration of the crystal field and charge compensation. The thermal stability of the partially substituted phosphor was significantly enhanced and the emission intensity at 423 K was approximately 82.3% of the initial value at room temperature. The internal quantum efficiency of the partially substituted sample is about 49.5%. A white light-emitting diode (LED) manufactured by the partially substituted red Mg0.7Ca0.2Mo0.8W0.2O3.8F0.2: 0.10Eu3+, combined with commercial blue-green phosphors and 395 nm chips exhibits high performance featuring CCT = 5441 K and Ra = 88.7. These results mean that the partially combined Ca2+-W6+-F− substitution in MgMoO4: Eu3+ can be used to optimize luminescent properties of phosphors applied in white LEDs. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
|
Full text from SpringerLink