@article{Deng2026, 
author = {Kaiyuan Deng and Chuanlong Wang and Xiaohui Lin and Wenjin Li and Ruonan Zhang and Chengshuai Chang and Chonghui Li and Shoaib Nazir and Yihua Hu and Guangliang Gary Liu},
title = {Spectral engineering of Mn4+/Ba2+ co-doped perovskite phosphors for high-performance plant cultivation LED},
year = {2026},
journal = {Journal of Materiomics},
volume = {12},
number = {4},
keywords = {Thermal stability, Mn4+ doped, Narrowband far-red luminescence, Internal quantum efficiency, Plant cultivation LED},
url = {https://www.sciopen.com/article/10.1016/j.jmat.2026.101222},
doi = {10.1016/j.jmat.2026.101222},
abstract = {Oxide perovskite phosphors (ABO3-type) are promising light-conversion materials for controlled-environment agriculture, but their large indirect bandgaps (3.0–4.7 eV) and strong thermal quenching limit radiative efficiency and stability. In this study, a dual-site engineering strategy is applied to LaMg0.5Sn0.5O3, where partial substitution of Ge4+ for Sn4+ yields a wide-bandgap LaMg0.5Ge0.3Sn0.2O3 host (Eg ≈ 3.7 eV). Density functional theory (DFT) and experimental characterizations confirm that Mn4+ doping introduces mid-gap states, enabling efficient, host-decoupled far-red emission (~703 nm) via the 2E → 4A2 transition. Ba2+ co-doping further enhances the emission intensity by 1.67-fold via charge compensation. The resulting LaMg0.5Ge0.3Sn0.2O3:Mn4+, Ba2+ phosphor exhibits intense and narrow far-red emission (FWHM = 20 nm), a peak internal quantum efficiency of 98.8%, and thermal stability with 78.9% emission retention at 150 ℃. Its emission spectrum aligns well with the absorption profiles of phytochrome Pfr and chlorophyll b, facilitating enhanced photosynthetic response. In proof-of-concept garlic cultivation trials, the fabricated far-red phosphor-converted LEDs demonstrated the capability to effectively promote biomass accumulation and morphological development under a time-segmented lighting schedule. This dual-doping approach provides a versatile design framework for high-performance far-red phosphors in sustainable agriculture lighting.}
}