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

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Marketech Intl, Inc.

  

192 Otto Street

  

Port Townsend, WA 98368

  
Tel: 360-379-6707  
Toll Free: 877-452-4910  
   
 

 

 

 

 

 

 

 
 
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