This article mainly introduces the important basic parameters of LED chips
1. LED chip forward working current If:
It refers to the forward current value when the light-emitting diode emits light normally. In actual use, IF should be selected below 0.6·IFm according to needs.
2. Forward operating voltage VF:
The operating voltage given in the parameter table is obtained under a given forward current. Generally it is measured when IF=20mA. The forward working voltage VF of the light-emitting diode is 1.4~3V. When the outside temperature increases, VF will decrease.
3. LED chip V-I characteristics:
The relationship between the voltage and current of the light-emitting diode. When the forward voltage is less than a certain value (called the threshold), the current is extremely small and no light is emitted. When the voltage exceeds a certain value, The forward current increases rapidly with the voltage and emits light.
4. Luminous intensity IV:
The luminous intensity of a light-emitting diode usually refers to the luminous intensity in the direction of the normal (for a cylindrical light-emitting tube, its axis). If the radiation intensity in this direction is (1/683) W/sr, it emits 1 candela (symbol is cd). Since the intensity of the light-emitting diodes of general LEDs is small, the unit of luminous intensity is often candelas (mcd).
5. LED light-emitting angle:
-90°-+90°
6. LED chip spectral half-width Δλ:
It represents the spectral purity of the light-emitting tube.
7. Half value angle θ1/2 and viewing angle:
θ1/2 refers to the angle between the direction where the luminous intensity value is half of the axial intensity value and the luminous axis (normal direction).
8.Full format:
The angle calculated based on the solid angle of LED light emission is also called plane angle.
9. Viewing angle:
Refers to the maximum angle of LED light emission. The application is different depending on the viewing angle. It is also called light intensity angle.
10. Half-shaped:
The angle between the normal 0° and the maximum luminous intensity value/2. Strictly speaking, it is the angle corresponding to the maximum luminous intensity value and the maximum luminous intensity value/2. The LED packaging technology causes the maximum luminous intensity value not to be the normal 0° light intensity value. The deviation angle refers to the angle between the maximum luminous intensity value and the normal 0°.
11. The maximum forward DC current IFm of the LED chip:
The maximum allowed forward DC current exceeds this value and the diode may be damaged.
12. Maximum reverse voltage VRm:
The maximum allowed reverse voltage exceeds this value and the light-emitting diode may be damaged by breakdown. bad.
13. LED chip working environment topm:
The ambient temperature range in which the light-emitting diode can work normally. Below or above this temperature range, the light-emitting diode will not work properly and its efficiency will be greatly reduced.
14. Allowable power consumption Pm:
The maximum value allowed to be applied to the product of the forward DC voltage across the LED and the current flowing through it. If this value is exceeded, the LED will become hot and damaged.
LED chip search LED network
ANNA