CT-161-CD Fujitsu Semiconductor America Inc, CT-161-CD Datasheet - Page 47

• Manufacturer Part Number: CT-161-CD
• Description: KIT 16LX FOR MB90F387
• Manufacturer: Fujitsu Semiconductor America Inc
• Series: F²MC-16LXr
• Type: MCUr

Specifications of CT-161-CD

• Contents: Board, Cable, CD
• For Use With/related Products: MB90F387S
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 865-1103

© Fujitsu
2.2
The LED has a pn-junction structure, which is the most fundamental structure of
semiconductor devices. As shown in Figure 2.3, the pn-junction structure consists of a
p-type semiconductor containing many electron holes and an n-type semiconductor containing
many electrons that are joined to each other.
When a voltage is applied across the pn-junction structure so that the n-type semiconductor is
at a negative potential with respect to the p-type semiconductor, electrons move from the
n-type semiconductor to the p-type semiconductor , electron holes move in the reverse
direction, and thereby a current flows. Then, some of electron holes and electrons collide
with each other and are combined together. When an electron hole and an electron are
combined together, they lose their energy partially, and the lost energy is emitted in the form
of light. The color of emitted light depends on the material of the semiconductor. Table 2.1
shows examples of semiconductor materials and corresponding colors of emitted light.
How can the LED emit light?
+ electrode
Figure 2.2
Figure 2.3 pn-junction structure
+
+
+
+
p type
+
+
pn-junction surface
LEDs mounted on the board
+
+
+
+
emission
-
Light
41
-
-
-
-
-
n type
-
-
-
-
-
-
- electrode