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<p>This article focuses on the synthesis and characterization of KMq<sub>3</sub>: CTAB (Where K: potassium, M: Mg: Magnesium, Sr: Strontium, Ca: Calcium, Ba: Barium, q: 8-Hydroxy Quinoline and CTAB: Cetyltrimethylammonium Bromide ) organometallic complexes by precipitation method with 8- hydroxyquinoline and respective metal nitrates as precursors. Despite the widespread interest in metal quinolate (Mq₃) complexes for their promising photoluminescent properties, limited research has focused on the synergistic effects of alkaline earth metal substitution (M = Mg, Sr, Ca, Ba) and surfactant-assisted synthesis on their structural, morphological, and luminescent behaviour. Existing literature primarily addresses individual aspects of these phosphors, lacking a holistic understanding of how both metal ion variation and surface modification influence their performance in optoelectronic devices. This study addresses this gap by systematically exploring KMq₃:CTAB phosphors synthesized via a controlled wet chemical method, with CTAB employed to regulate particle morphology and enhance optical performance. Comprehensive analyses, including X-ray diffraction (XRD) and Fourier Transform Infrared Spectroscopy (FTIR) spectroscopy assured the existence of 8-HQ functional groups and the metal within the synthesized complexes. Energy-Dispersive X-ray Spectroscopy (EDX) and High-Resolution Scanning Electron Microscopy (HRSEM) analysis reveals that their morphology and particle size changed with variation in the metal atom. Various parameters of absorption reveal the potential of the complexes as light-emissive phosphors. Photoluminescent (PL) spectroscopy reveal that the choice of M²⁺ ion significantly alters crystal structure, particle morphology, and emission profiles with broad emission from 425&#xa0;nm to 475&#xa0;nm that falls in the bluish/bluish green region of the visible region of the electromagnetic spectrum. Among all the synthesized complexes, the maximum intensity was observed for KMgq<sub>3</sub>: CTAB followed by KCaq<sub>3</sub>: CTAB and KSrq<sub>3</sub>: CTAB. Photometric parameters reveal blue/bluish-green emission. Notably, CTAB-assisted synthesis leads to improved dispersion, reduced surface defects, and enhanced luminescence efficiency. The results demonstrate that tailored KMq₃:CTAB phosphors exhibit tunable and intense emission characteristics, making them highly suitable for next-generation optoelectronic applications such as Organic Light Emitting Diodes, flat panel displays and Solid State Lighting.</p>

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Exploring the structural, morphological and luminescence attributes of KMq3:CTAB (M = Mg, Sr, Ca, Ba) phosphor for optoelectronic applications

  • 期刊论文

  • 发表日期：

    2025年7月24日

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  • Ritesh Raikundliya,
  • N. Thejo Kalyani,
  • S. J. Dhoble

摘要

This article focuses on the synthesis and characterization of KMq3: CTAB (Where K: potassium, M: Mg: Magnesium, Sr: Strontium, Ca: Calcium, Ba: Barium, q: 8-Hydroxy Quinoline and CTAB: Cetyltrimethylammonium Bromide ) organometallic complexes by precipitation method with 8- hydroxyquinoline and respective metal nitrates as precursors. Despite the widespread interest in metal quinolate (Mq₃) complexes for their promising photoluminescent properties, limited research has focused on the synergistic effects of alkaline earth metal substitution (M = Mg, Sr, Ca, Ba) and surfactant-assisted synthesis on their structural, morphological, and luminescent behaviour. Existing literature primarily addresses individual aspects of these phosphors, lacking a holistic understanding of how both metal ion variation and surface modification influence their performance in optoelectronic devices. This study addresses this gap by systematically exploring KMq₃:CTAB phosphors synthesized via a controlled wet chemical method, with CTAB employed to regulate particle morphology and enhance optical performance. Comprehensive analyses, including X-ray diffraction (XRD) and Fourier Transform Infrared Spectroscopy (FTIR) spectroscopy assured the existence of 8-HQ functional groups and the metal within the synthesized complexes. Energy-Dispersive X-ray Spectroscopy (EDX) and High-Resolution Scanning Electron Microscopy (HRSEM) analysis reveals that their morphology and particle size changed with variation in the metal atom. Various parameters of absorption reveal the potential of the complexes as light-emissive phosphors. Photoluminescent (PL) spectroscopy reveal that the choice of M²⁺ ion significantly alters crystal structure, particle morphology, and emission profiles with broad emission from 425 nm to 475 nm that falls in the bluish/bluish green region of the visible region of the electromagnetic spectrum. Among all the synthesized complexes, the maximum intensity was observed for KMgq3: CTAB followed by KCaq3: CTAB and KSrq3: CTAB. Photometric parameters reveal blue/bluish-green emission. Notably, CTAB-assisted synthesis leads to improved dispersion, reduced surface defects, and enhanced luminescence efficiency. The results demonstrate that tailored KMq₃:CTAB phosphors exhibit tunable and intense emission characteristics, making them highly suitable for next-generation optoelectronic applications such as Organic Light Emitting Diodes, flat panel displays and Solid State Lighting.