Citation: Nian LIU, Biao ZHENG, Kun WANG, Chunbao ZHENG, Qingyan HAN, Enjie HE, Saidong XUE. Synthesis and spectroscopic performance of double perovskite Li_0.5La_0.5MgSrWO₆∶Mn⁴⁺ phosphors for plant growth lighting[J]. Chinese Journal of Inorganic Chemistry, ;2026, 42(1): 129-140. doi: 10.11862/CJIC.20250069 shu

Synthesis and spectroscopic performance of double perovskite Li_0.5La_0.5MgSrWO₆∶Mn⁴⁺ phosphors for plant growth lighting

Nian LIU ¹ ,
Biao ZHENG ² ,
Kun WANG ² ,
Chunbao ZHENG ² ,
Qingyan HAN ³ ,
Enjie HE ^{1, 4,,} ,
Saidong XUE ¹

1.
School of Electrical and Electronic Engineering, Anhui Science and Technology University, Bengbu, Anhui 233030, China
2.
School of Intelligent Manufacturing, Anhui Science and Technology University, Bengbu, Anhui 233100, China
3.
School of Electronic Engineering, School of Science, Xi′an University of Posts and Telecommunications, Xi′an 710121, China
4.
College of information & Network Engineering, Anhui Science and Technology University, Bengbu, Anhui 233030, China

Corresponding author: Enjie HE, heej@ahstu.edu.cn
Received Date: 2 March 2025
Revised Date: 6 November 2025

Figures(9)

A series of Mn⁴⁺ doped Li_0.5La_0.5MgSrWO₆∶xMn⁴⁺ (LLMSW∶xMn⁴⁺) phosphors based on the A-site cation substitution strategy were synthesized by the high-temperature solid-state reaction method, and their structure and properties were investigated systematically. The results showed that the prepared LLSMW∶xMn⁴⁺ phosphors had an octahedral structure. In this structure, Mn⁴⁺ occupied the center of the octahedron. And the co-doped Li⁺ coupled with La³⁺ formed a cation-pair, which not only balances charges but also changes the local symmetry of the Mn⁴⁺ site. Meanwhile, the introduction of cation pairs may break the reversal symmetry of the luminescence center and facilitate the luminescence enhancement of the ²E_g→⁴A_2g transition. The LLSMW∶xMn⁴⁺ phosphors had a broad excitation band in the range of 270-600 nm, attributed to the Mn→O charge transfer band (318 nm), ⁴A_2g→⁴T_1g (342 nm), ⁴A_2g→²T_2g (361 nm), and ⁴A_2g→⁴T_2g (484 nm) spin-allowed transitions of Mn⁴⁺ ions, respectively. Excited by 332 nm light, the photoluminescence (PL) spectrum with the peak at 708 nm had a broad band between 650 and 800 nm due to the ²E_g→⁴A_2g transition of Mn⁴⁺. The optimal doping concentration of Mn⁴⁺ was 0.012, with a 1.528 ms decay lifetime, and its quantum yield was 65.74%. When the temperature rose to 423 K, the fluorescence intensity decreased to 53.1% of that at room temperature, and the activation energy was 0.32 eV. A deep red-emitting LED device with a 365 nm near ultraviolet (NUV) chip was fabricated. The color coordinates of the LED were located at (0.724 0, 0.269 6), and the color purity was determined to be 98.1% under excitation at a current of 40 mA. Furthermore, its electroluminescence (EL) spectrum could effectively match the absorption spectrum of phytochrome (P_fr).
- phosphors,
- Mn⁴⁺,
- phytochrome,
- perovskite
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Synthesis and spectroscopic performance of double perovskite Li0.5La0.5MgSrWO6∶Mn4+ phosphors for plant growth lighting

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通讯作者: 陈斌, bchen63@163.com

Synthesis and spectroscopic performance of double perovskite Li_0.5La_0.5MgSrWO₆∶Mn⁴⁺ phosphors for plant growth lighting