Ordinary light-emitting diode positive saturation voltage drop of 1.6 V to 2.1V, the positive current of 20 mA is 5 ~
The characteristics of LED
1. Limit the significance of parameters
(1) to allow power Pm: Allow increases in LED ends positive DC voltage and the current flowing through the plot of the maximum. More than this value, LED fever, which damaged.
(2) Maximum forward DC current IFm: Allow the largest increase positive DC current. This value can be damaged more than diode.
(3) The maximum reverse voltage VRm: the largest increase allowed by the reverse voltage. More than this value, light-emitting diode breakdown may be damaged.
(4) working environment topm: light-emitting diodes can be normal working environment temperature range. Below or above this temperature range, and light-emitting diodes will not work, efficiency has been greatly reduced.
2. Electrical parameters of significance
(1) If current positive work: It refers to the normal light-emitting diode LED forward current value of the. In the actual use of options should be based on need IF 0.6 IFm following.
(2) positive voltage VF: parameters of the work are given in the table in a given voltage is positive under the current. In general, IF = 20mA measured by. LED forward voltage of 1.4 ~ 3 VF V. In the outside temperature rises, VF will decline.
(3) VI characteristics: light emitting diodes the relationship between voltage and current
In the forward voltage is less than a certain value (called thresholds), the current minimum, non-luminous. When the voltage exceeds a certain value, being current with the rapid increase in voltage, luminescence. VI curve can be drawn from the LED's forward voltage, and reverse-current parameters, such as reverse voltage. Positive LED reverse leakage current IR <10 μ A below.
LED classification
1. By luminous color LED -
LED by the luminous color, can be divided into red, orange and green (or sub-yellow-green, the standard green and pure green), such as Blu-ray. In addition, some light-emitting diodes contain two kinds of chips or three colors.
Under the light of the light-emitting diode-doped or not-doped scattering agent, colored or colorless, these color light-emitting diodes can be divided into colored transparent, colorless, transparent, colored and colorless scattering scattering four types. Scattering of light-emitting diodes and to do light up with.
2. LED by a smooth feature points
Smooth out by the luminescence characteristics of the circular lights, the lights, rectangular, glass surface, the side of the surface, such as the use of micro-installed. By circular lights into φ2 mm diameter, φ4.4 mm, φ5 mm, φ8 mm, φ10 mm and φ20 mm, etc.. Φ3 mm abroad usually recorded as the light-emitting diodes T-1; φ5 mm to the entry for T-1 (3 / 4); the φ4.4 mm for the entry of T-1 (1 / 4).
From the half-value angle can be estimated size round luminous intensity distribution angle. Angle from the luminous intensity distribution to the three categories:
(1) high directivity. Generally cusp epoxy package, or with metal reflector cavity package, without scattering of Canada. Half-value angle of 5 ° to 20 ° or less, and have a high point of the light source can be used for local use or for the detection and optical components for the automatic detection system.
(2) standard. Usually used for light, the half-value angle of 20 ° to 45 °.
(3) scattering type. This is an indicator that larger perspective, the half-value angle of 45 ° to 90 ° or greater, there is a large amount of scattering.
3. On the structure of the light-emitting diode
On the structure of light-emitting diodes at a full-epoxy encapsulation, metal base epoxy package, the base ceramic packages and glass epoxy packaging structure.
4. Luminous intensity and work on the current
Luminous intensity and work according to the current ordinary brightness LED (light-emitting intensity <10 mcd); ultra-high brightness LED (light-emitting intensity> 100 mcd); luminous intensity in the 10 to 100 mcd called the high-brightness light-emitting diodes .
General LED current in the work of dozens mA to 10 mA, and low-current LED current work in the following 2 mA (brightness and the same general LED).
In addition to the above classification, but also by chip materials classification and functional classification method.
As light-emitting diodes IFm maximum forward current, the biggest reverse voltage VRm restrictions, use, should ensure that no more than this value. For the sake of safety, the actual current 0.6 IFm IF should be less likely to be the reverse voltage VR <0.6 VRm.
-------------------------------------------------- -----------------------------------
-------------------------------------------------- -----------------------------------
There are three super-bright light-emitting diode color, but the pressure drop of three light-emitting diodes are not the same.
One red pressure is 2.0 - 2.2 V
Yellow for the pressure drop 1.8-2.0 V
Green 3.0-3.2 V for the pressure drop.
The normal luminous are rated current 20 mA.
-------------------------------------------------- -----------------------------------
-------------------------------------------------- -----------------------------------
Luminescent white light-emitting diodes and other tenets of the light-emitting diode LED principle just a little different. There are two LED mode enables a white-light-emitting diodes. One is a two-wavelength blue + yellow light mode luminous white light-emitting diodes, the structure as shown in Figure 1, on the basis of part of a blue light-emitting diode, in the blue light-emitting diode chips outside coverage a phosphor layer, when the blue light-emitting diode chips launched by the blue light, in part through the fluorescence of the phosphor was absorbed into a yellow, yellow body with the Blu-ray fluorescence through mixed issued after the white light. For example, some white light-emitting diodes issued just white, but some Pianla issued by the White alone.
The other is a three wavelength blue-green light + + luminous red light mode, full-color light emitting diode structure as shown in Figure 2. The red, green and blue light-emitting diodes three in the same package of shell, the three primary colors of light can also produce mixed white, but due to the production of the full-color light-emitting diodes to the relatively high cost, it is generally not use the full-color light-emitting diodes to produce lighting, full-color light emitting diode is used mainly to create full-color display with full-color light emitting diode lighting carnivals produced significantly increase product costs.
White LED forward voltage drop and the other light-emitting diode forward voltage drop different.
The white light-emitting diode forward voltage drop of about 3.5 V about the need positive ≥ 15 mA current work about only when their normal luminous.
The characteristics of LED
1. Limit the significance of parameters
(1) to allow power Pm: Allow increases in LED ends positive DC voltage and the current flowing through the plot of the maximum. More than this value, LED fever, which damaged.
(2) Maximum forward DC current IFm: Allow the largest increase positive DC current. This value can be damaged more than diode.
(3) The maximum reverse voltage VRm: the largest increase allowed by the reverse voltage. More than this value, light-emitting diode breakdown may be damaged.
(4) working environment topm: light-emitting diodes can be normal working environment temperature range. Below or above this temperature range, and light-emitting diodes will not work, efficiency has been greatly reduced.
2. Electrical parameters of significance
(1) If current positive work: It refers to the normal light-emitting diode LED forward current value of the. In the actual use of options should be based on need IF 0.6 IFm following.
(2) positive voltage VF: parameters of the work are given in the table in a given voltage is positive under the current. In general, IF = 20mA measured by. LED forward voltage of 1.4 ~ 3 VF V. In the outside temperature rises, VF will decline.
(3) VI characteristics: light emitting diodes the relationship between voltage and current
In the forward voltage is less than a certain value (called thresholds), the current minimum, non-luminous. When the voltage exceeds a certain value, being current with the rapid increase in voltage, luminescence. VI curve can be drawn from the LED's forward voltage, and reverse-current parameters, such as reverse voltage. Positive LED reverse leakage current IR <10 μ A below.
LED classification
1. By luminous color LED -
LED by the luminous color, can be divided into red, orange and green (or sub-yellow-green, the standard green and pure green), such as Blu-ray. In addition, some light-emitting diodes contain two kinds of chips or three colors.
Under the light of the light-emitting diode-doped or not-doped scattering agent, colored or colorless, these color light-emitting diodes can be divided into colored transparent, colorless, transparent, colored and colorless scattering scattering four types. Scattering of light-emitting diodes and to do light up with.
2. LED by a smooth feature points
Smooth out by the luminescence characteristics of the circular lights, the lights, rectangular, glass surface, the side of the surface, such as the use of micro-installed. By circular lights into φ2 mm diameter, φ4.4 mm, φ5 mm, φ8 mm, φ10 mm and φ20 mm, etc.. Φ3 mm abroad usually recorded as the light-emitting diodes T-1; φ5 mm to the entry for T-1 (3 / 4); the φ4.4 mm for the entry of T-1 (1 / 4).
From the half-value angle can be estimated size round luminous intensity distribution angle. Angle from the luminous intensity distribution to the three categories:
(1) high directivity. Generally cusp epoxy package, or with metal reflector cavity package, without scattering of Canada. Half-value angle of 5 ° to 20 ° or less, and have a high point of the light source can be used for local use or for the detection and optical components for the automatic detection system.
(2) standard. Usually used for light, the half-value angle of 20 ° to 45 °.
(3) scattering type. This is an indicator that larger perspective, the half-value angle of 45 ° to 90 ° or greater, there is a large amount of scattering.
3. On the structure of the light-emitting diode
On the structure of light-emitting diodes at a full-epoxy encapsulation, metal base epoxy package, the base ceramic packages and glass epoxy packaging structure.
4. Luminous intensity and work on the current
Luminous intensity and work according to the current ordinary brightness LED (light-emitting intensity <10 mcd); ultra-high brightness LED (light-emitting intensity> 100 mcd); luminous intensity in the 10 to 100 mcd called the high-brightness light-emitting diodes .
General LED current in the work of dozens mA to 10 mA, and low-current LED current work in the following 2 mA (brightness and the same general LED).
In addition to the above classification, but also by chip materials classification and functional classification method.
As light-emitting diodes IFm maximum forward current, the biggest reverse voltage VRm restrictions, use, should ensure that no more than this value. For the sake of safety, the actual current 0.6 IFm IF should be less likely to be the reverse voltage VR <0.6 VRm.
-------------------------------------------------- -----------------------------------
-------------------------------------------------- -----------------------------------
There are three super-bright light-emitting diode color, but the pressure drop of three light-emitting diodes are not the same.
One red pressure is 2.0 - 2.2 V
Yellow for the pressure drop 1.8-2.0 V
Green 3.0-3.2 V for the pressure drop.
The normal luminous are rated current 20 mA.
-------------------------------------------------- -----------------------------------
-------------------------------------------------- -----------------------------------
Luminescent white light-emitting diodes and other tenets of the light-emitting diode LED principle just a little different. There are two LED mode enables a white-light-emitting diodes. One is a two-wavelength blue + yellow light mode luminous white light-emitting diodes, the structure as shown in Figure 1, on the basis of part of a blue light-emitting diode, in the blue light-emitting diode chips outside coverage a phosphor layer, when the blue light-emitting diode chips launched by the blue light, in part through the fluorescence of the phosphor was absorbed into a yellow, yellow body with the Blu-ray fluorescence through mixed issued after the white light. For example, some white light-emitting diodes issued just white, but some Pianla issued by the White alone.
The other is a three wavelength blue-green light + + luminous red light mode, full-color light emitting diode structure as shown in Figure 2. The red, green and blue light-emitting diodes three in the same package of shell, the three primary colors of light can also produce mixed white, but due to the production of the full-color light-emitting diodes to the relatively high cost, it is generally not use the full-color light-emitting diodes to produce lighting, full-color light emitting diode is used mainly to create full-color display with full-color light emitting diode lighting carnivals produced significantly increase product costs.
White LED forward voltage drop and the other light-emitting diode forward voltage drop different.
The white light-emitting diode forward voltage drop of about 3.5 V about the need positive ≥ 15 mA current work about only when their normal luminous.
Order Informations(RSS)