The photoluminescence quantum yield (PLQY) of tetramethyl ammonium manganese(II) chloride, (CH₃)₄NMnCl₃ (TMMC), doped with Cd²⁺/Cu²⁺ is analyzed through photoluminescence measurements, X-ray diffraction, optical absorption, and time-resolved excitation and emission under hydrostatic pressure. Contrary to recent studies reporting a PLQY increase up to x = Cd_x/Mn_1-x = 0.08 followed by a decline (from 95% to 77% at x = 0.22),¹ we demonstrate that the PLQY remains consistently high (≥95%) across the concentration range x = 0–0.22.

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The author declares no conflict of interest.

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Data Availability Statement

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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Correspondence on “Suppressing Energy Migration via Antiparallel Spin Alignment in One-Dimensional Mn²⁺ Halide Magnets with High Luminescence Efficiency”

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Correspondence on “Suppressing Energy Migration via Antiparallel Spin Alignment in One-Dimensional Mn2+ Halide Magnets with High Luminescence Efficiency”

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Correspondence on “Suppressing Energy Migration via Antiparallel Spin Alignment in One-Dimensional Mn²⁺ Halide Magnets with High Luminescence Efficiency”