Facile hydrothermal synthesis of rare earth hydroxycarbonate phosphors for high-performance warm white LEDs
Taihui
Chen 
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Xiaoli
Wu
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Xiaoli
Wu
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Abstract
The traditional synthesis of inorganic phosphors often requires complex procedures, including precursor preparation and high-temperature treatment. In contrast, this study introduces a simplified hydrothermal precipitation approach for fabricating europium/terbium hydroxycarbonates (Eu2(OH)x(CO3)y(NO3)(6−x−2y)·nH2O and analogous Tb compound). The synthesized materials demonstrate high thermal stability, with high quenching activation energies (Ea(Eu) = 0.283 eV, Ea(Tb) = 0.221 eV). When applied in white LED devices, these phosphors demonstrate warm white light emission with a color rendering index (CRI) reaching Ra = 84.0 and correlated color temperature (CCT) of 3865 K, making them promising for lighting applications.
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