4inch Sapphire Wafer DSP Diameter 100mm Thickness 500μm Ra ≤ 0.2nm
For Micro-LED
The 4-inch sapphire wafer is a high-quality optical-grade substrate fabricated from
single-crystal aluminum oxide (α-Al₂O₃) via Edge-defined Film-fed
Growth (EFG) or Kyropoulos (KY) methods, with standard dimensions
of 100mm±0.2mm diameter and customizable thickness (0.3-1.0mm).
Compared to 6-inch wafers, the 4-inch sapphire wafer offers greater cost efficiency for R&D and small-batch
production, particularly suited for applications requiring high
crystalline quality but not large-area formats, such as UV LEDs, RF
devices, and specialized sensors. Its balanced performance and
affordability make it ideal for research institutions, startups,
and small-to-medium chip manufacturers.
Key Characteristics
1. 4inch sapphire wafer of High Purity: 99.999% pure with superior
surface finish and flatness, meeting stringent application
requirements.
2. 4inch sapphire wafer of exceptional Mechanical Properties:High
hardness, strength, and impact resistance, suitable for
high-temperature growth environments and mechanical processing.
3. 4inch sapphire wafer of outstanding Optical Performance: High
transmittance (>85%) with broad-band transparency (UV to
mid-IR), ideal for diverse optical applications.
4. 4inch sapphire wafer of strong Chemical Stability:
Corrosion-resistant and wear-resistant, ensuring long-term
performance in harsh environments.
5. 4inch sapphire wafer of excellent Electrical Insulation:
Superior insulating properties make it an ideal substrate for
large-scale integrated circuits (ICs) and SOI thin-film
fabrication.
Technical Parameters
| Property | 4inch |
| Diameter | 100±0.1mm |
| Thickness | 200±15um |
500 ± 15 um |
650±15um |
| Roughness | Ra ≤ 0.2nm |
| Warp | ≤ 10um |
| TTV | ≤ 10um |
| Scratch/Dig | 20/10 |
| Polish | DSP (Double Side Polished); SSP(Single Side Polished) |
| Shape | Round, Flat 16mm；OF length 22mm; OF Length 30/32.5mm; OF
Length47.5mm; NOTCH; NOTCH; |
| Edge Form | 45°,C Shape |
| Material | Sapphire crystal, Fused Quartz JGS1/JGS2; BF33, D263; EXG glass. |
| Remarks | All specifications above can be customized upon your request |
Primary Applications
1. 4inch sapphire wafer of LED Industry: Used as a substrate for LED chips (blue/green LEDs), meeting
demands in lighting and display technologies.
2. 4inch sapphire wafer of semiconductor Manufacturing: Essential for GaN/AlGaN LEDs and power devices, serving as an
optimal substrate for SOCs and superconducting thin-film
structures.
3. 4inch sapphire wafer of optical Components: Applied in optical windows, laser elements, and thermoluminescent
detectors due to high transmittance and stability.
4. 4inch sapphire wafer of medical Devices: Utilized in medical optical lenses for high-end equipment,
leveraging its high-temperature resistance, corrosion resistance,
and precision.
5. 4inch sapphire wafer of research & Industrial Use: Critical for scientific experiments and industrial components
(e.g., cutting/polishing wafers).
