We present LOMS.cz (Luminescence, Optical and Magneto-optical Software), an open-source computational platform that addresses the long-standing challenge of standardizing Judd-Ofelt (JO) calculations in rare-earth spectroscopy. Despite JO theory's six-decade history as the fundamental framework for understanding [Formula: see text] transitions, the field lacks standardized computational methodologies for precise and reproducible parameter determination. LOMS integrates three key innovations: (1) automated computation of JO parameters, transition probabilities, branching ratios, and theoretical radiative lifetimes, (2) a dynamically expanding database of experimentally validated parameters enabling direct comparison between computed and empirical results, and (3) a novel Combinatorial JO (C-JO) analysis algorithm that systematically identifies optimal absorption band combinations to ensure reliable parameter extraction. As a proof-of-concept, we demonstrate how this computational framework enables rapid screening of spectroscopic parameters, allowing researchers to predict optical properties with enhanced reliability. By combining automated analysis with experimental validation through its integrated database, LOMS.cz establishes a standardized platform for accelerating the discovery and optimization of rare-earth-based photonic and optoelectronic materials.

Department of Inorganic Chemistry Faculty of Chemical Technology University of Chemistry and Technology Technicka 5 166 28 Prague Czech Republic

Department of Physical and Macromolecular Chemistry Faculty of Science Charles University Hlavova 8 12843 Prague 2 Czech Republic

Department of Physics New Mexico State University MSC 3D Las Cruces NM 88003 8001 USA

Faculty of Mathematics and Physics Charles University Ke Karlovu 5 121 16 Prague Czech Republic

Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences Flemingovo n 2 16610 Prague 6 Czech Republic

Institute of Photonics and Electronics of the Czech Academy of Sciences Chaberska 1014 57 182 00 Prague Czech Republic

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