led常识之led特性!（Led the LED property of common sense!）.docVIP

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led常识之led特性!（Led the LED property of common sense!）.doc

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led常识之led特性!（Led the LED property of common sense!）

led常识之led特性!（Led the LED property of common sense!） Obviously, the relative intensity of illumination in the normal direction is 1, and the greater the angle away from the normal, the smaller the relative intensity of illumination. From this, a half value angle or angle value can be obtained. (5) positive working current If: it is the forward current value when the LED is normally luminous. In actual use, IF should be chosen below 0.6. IFm as required. (6) forward operating voltage VF: the operating voltage given in the parameter list is obtained under a given forward current. Usually measured at IF=20mA. The positive working voltage of LED is between 1.4 and 3V VF. As the outside temperature rises, the VF will fall. (7) V-I characteristics: the relationship between the voltage and the current of the LED can be expressed in figure 4. When the forward voltage is less than a certain value (called threshold), the current is very small and does not emit light. When the voltage exceeds a certain value, the forward current increases rapidly with the voltage. The forward voltage, reverse current and reverse voltage of the LED can be obtained by the V-I curve. The forward light emitting diode has a reverse leakage current of IR10 mu A. (three) classification of LED 1. according to the luminous color of the luminous tube According to the luminous color of the luminous tube, it can be divided into red, orange, green (subdivided green yellow, standard green and pure green), blue light and so on. In addition, some LEDs contain chips of two or three colors. The light emitting diodes can be divided into four types: colored transparent, colorless transparent, colored scattering and colorless scattering, according to the light emitting diode with or without scattering agent, colored or colorless. A scattering led and used as an indicator. 2. according to the luminous characteristics of the luminous tube According to the luminous characteristics of the luminous tube, the dividing la