| Autor: |
Hu, Shaozu, Yang, Fugui, Ren, Haike, Wu, Yonghua, Yan, Fengpo, Yu, Yunlong |
| Předmět: |
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| Zdroj: |
Applied Physics A: Materials Science & Processing; Jun2024, Vol. 130 Issue 6, p1-8, 8p |
| Abstrakt: |
High efficiency Li0.5La0.5SrMgWO6:Mn4+,Eu3+ phosphor was synthesized via the solid-state reaction technique. The XRD, excitation, emission spectra, as well as temperature sensing properties were quantitatively measured. Upon excitation by a 395-nm LED source, the emission peaks were observed at 615 nm and 693 ∼ 707 nm. The quantum efficiency was obtained to be 69%, and the slope efficiency was determined to be 21%. We have also observed that the fluorescence intensity can be modulated through two means, namely, the concentration ratio of Eu3+:Mn4+ and the substitution position of Eu3+. The highest intensity ratio between 615 nm and 693 nm occurs when Eu3+: Mn4+ = 20:1. And the sample "0.5Sr 0.5Mg" exhibits the highest intensity ratio between 615 nm and 693 nm. The fluorescence mechanism has been discussed in light of the theory of energy level transitions, which suggests that the phenomenon of cross relaxation ensures high efficiency. Finally, we investigated the temperature sensing properties of "0.1%Mn 1%Eu" and "0.1%Mn 2%Eu" samples, revealing that the samples exhibit a temperature sensing range of 0.2% ∼ 1.3% /K for Eu: Mn = 10 and 0.1% ∼ 0.4% /K for Eu: Mn = 20, indicating the former's superior suitability as a temperature-sensitive material. The material can be utilized not only for plant cultivation but also as a temperature sensor to monitor the environmental temperature during plant growth. In comparison with traditional Mn4+ doping materials, it is more suitable for plant cultivation, particularly in greenhouse facilities. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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