One-step melt synthesis of Zn²⁺-doped 2D manganese(II)-based coordination polymer phosphors

Abstract

To address the challenges of complex preparation procedures, high organic solvent consumption, and poor environmental stability of products in conventional phosphor synthesis, this study proposes a simple, low-cost, solventfree one-step melt synthesis strategy, by which a series of Zn²⁺-doped manganese-based coordination polymer phosphors, Mn_1−xZn_x(OAc)₂ (OAc=acetate), were prepared. During heating, Mn(OAc)₂·4H₂O releases its crystallization water to form a homogeneous molten phase, thereby yielding octahedrally coordinated anhydrous Mn(OAc)₂. Systematic investigations reveal that the optimal Zn²⁺ doping concentration (x=0.2) significantly enhances luminescence performance by suppressing defect-related non-radiative decay pathways and mitigating energy transfer between Mn²⁺ ions. The optimized Mn_0.8Zn_0.2(OAc)₂ phosphor achieves a photoluminescence quantum yield of 28.7% and a lifetime of 1.03 ms, while its PL intensity at 140 °C is enhanced by 54% compared with Mn(OAc)₂, demonstrating excellent thermal stability. By integrating this red-emitting phosphor with commercial blue and yellow phosphors onto UV chips to fabricate full-spectrum white LEDs, ideal white light emission with CIE coordinates of (0.34, 0.35) is realized. This work provides a simple, environmentally benign, and scalable route for preparing high-performance Mn(II)-based coordination polymer phosphors for next-generation solid-state lighting applications.

Keywords

Zn²⁺ doping / melt synthesis / phosphors / manganese(II)-based coordination polymers / environmental stabilities

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