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Marketech International Inc.
107B Louisa Street
Port Townsend, WA 98368
Tel: 360-379-6707
Toll Free: 877-452-4910
Fax: 360-379-6907
info@mkt-intl.com
107B Louisa Street
Port Townsend, WA 98368
Tel: 360-379-6707
Toll Free: 877-452-4910
Fax: 360-379-6907
info@mkt-intl.com
Sapphire Substrates for Blue LEDs
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Crystal Structure
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Hexagonal
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Lattice Constant A
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a - 4,765
c - 13,000 |
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Orientation
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C-axis (0001) ± 0.1°
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Diameter: 2"
Diameter: 3" |
50.80 ± 0.05 mm
76.2 ± 0.05 mm |
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Thickness: 2" dia
Thickness: 3" dia |
330 - 430 ± 50µm
380 - 480 ± 50µm |
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TTV: 2"dia
TTV: 3" dia |
<20 µm
<25 µm |
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Bow: 2" dia
Bow: 3" dia |
<20 µm
<25 µm |
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Front Surface
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Epi polish
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Backside
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Fine ground or Polished
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Flatness
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<5 microns
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Surface
roughness (Ra) |
<0.3nm
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Orientation Flat: 2" dia
Orientation Flat: 3" dia |
16 mm ± 0.5 mm
22 mm ± 0.5 mm |
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Primary Flat Location
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A-axis [11-20] ± 0.5° or
M-axis [10-10] ± 0.5° |
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Secondary Flat
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90° counterclockwise to primary
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Bow
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<2 µm, misoriented substrates,
other wafer tolerances available |
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Control methods
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Raw sapphire: inductively coupled argon plasma
Crystal Quality: polarized light, focused light Orientation: X-ray Surface quality: AFM & Interferometer. |
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Call 360-379-6707 for specifications on other sizes.
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