Overview
Indium-doped Zinc Sulfide (ZnS:In) is a modified II-VI semiconductor compound where indium atoms are incorporated into the zinc sulfide lattice. This doping process alters the material's electronic structure, enhancing its luminescent properties. ZnS:In is particularly valued for its ability to emit light under electrical excitation (electroluminescence) or X-ray irradiation. First studied in the mid-20th century for radar applications, ZnS:In has become crucial for modern optoelectronic technologies. The indium dopant introduces energy states within the bandgap, improving charge carrier mobility and luminescence efficiency compared to pure ZnS.
Physical and Chemical Properties
ZnS:In typically exhibits a cubic zinc blende or hexagonal wurtzite crystal structure, depending on synthesis conditions. The doping process (usually 0.1-5% indium) increases conductivity while maintaining ZnS's wide bandgap (~3.68 eV). This creates efficient blue-green luminescence centers when excited. Thermal stability remains high (up to 1,000°C in inert atmospheres), though dopant diffusion may occur at extreme temperatures. The material is chemically stable against oxidation but reacts with strong acids. Particle size distributions vary significantly (50nm-10μm) depending on production methods like solid-state reaction or chemical vapor deposition.
Main Applications
In thin-film electroluminescent (TFEL) displays, ZnS:In serves as the active luminescent layer in monochrome and multicolor panels for industrial instrumentation and aerospace displays. Its stability under continuous operation exceeds OLED alternatives. The material also functions in X-ray scintillators for medical imaging and security scanners, converting X-rays to visible light. Additional uses include electroluminescent lamps, UV sensors, and as a phosphor in specialized lighting systems. Emerging applications involve quantum dot displays when synthesized as nanoparticles.
Safety and Storage
As a fine powder, ZnS:In requires handling with NIOSH-approved particulate respirators to prevent pulmonary irritation. Although low in acute toxicity, chronic exposure should be controlled per OSHA guidelines (PEL 5mg/m³ for ZnS). Storage demands moisture-proof containers (desiccators recommended) with inert gas purging for long-term preservation. Degradation signs include color darkening and reduced luminescence output. Spills should be collected using non-sparking tools due to potential dust explosibility (ST1 classification).
B2B Procurement Guide
Industrial buyers should specify dopant concentration (usually 0.5-2% In for displays), particle size distribution (D50 value), and luminescence efficiency (quantum yield ≥65% for premium grades). Bulk orders (25kg+ drums) commonly attract 10-15% discounts. Key suppliers include specialty chemical manufacturers in the US, Germany, Japan, and China. Lead times range from 4-8 weeks for custom formulations. Certifications to request: RoHS compliance, XRD purity analysis (>99.9%), and batch-to-batch consistency reports. Sample testing under actual operating conditions (e.g., drive voltage for TFEL applications) is strongly advised.
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