Synthesis and photoluminescence properties of Ca2LaTaO6:Mn4+ phosphor for plant growth LEDs

By Renping Cao, Tao Chen, Yongchun Ren, Ting Chen, Hi Ao, Wensheng Li, Guotai Zheng. Journal of Alloys and Compounds, 2019

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Abstract The double perovskite-type structure Ca2LaTaO6:Mn4+ phosphor is synthesized successfully by solid-state reaction method in air. X-ray powder diffractions (XRD) patterns, energy dispersive X-ray (EDX) spectrum, morphology, luminescence properties, decay curves, temperature-dependent emission spectra, and time-resolved emission spectra of Ca2LaTaO6:Mn4+ phosphor are investigated. Ca2LaTaO6:Mn4+ phosphor shows deep red emission with the emission band peaking at 696 nm in the range of 600–800 nm due to the 2E → 4A2 transition of Mn4+ ion. The optimal Mn4+ concentration in Ca2LaTaO6:Mn4+ phosphor is ∼0.4 mol%. Lifetime decreases from 0.721 to 0.555 ms with increasing Mn4+ concentration in the range of 0.1–1.0 mol%. The concentration quenching mechanism is dominated by a dipole-dipole interaction. The activation energy is determined to be 0.3203 eV. The luminous mechanism and temperature quenching are explained by the Tanabe-Sugano energy level diagram and configuration coordinate diagram of Mn4+ ion, respectively. The red emitting light-emitting diode (LED) device is fabricated by using the Ca2LaTaO6:Mn4+ phosphor. The experimental results indicate that Ca2LaTaO6:Mn4+ phosphor has a potential applications in LEDs for plant growth.

Subfields: Electrical and Electronic Engineering, Materials Chemistry, Renewable Energy, Sustainability and the Environment

View Paper: https://www.semanticscholar.org/paper/7279c08879e2f4b76b9ea484cf9c7c5f2e3988d3