LED light-emitting diode selection points
The selection of LEDs should focus on the following characteristics:
a, color; b, package size; c, forward voltage; d, power consumption; e, cost; f, working temperature.
Led light-emitting diode features
2.1led LED basic structure
Light-emitting diodes are referred to as LEDs, and the main materials that make up LEDs include: die, adhesive, gold wire, bracket, and epoxy.
The following picture shows the manufacturing process of the SMD LED:
2.2 LED type
Light-emitting diodes are divided into two types: patch and plug-in according to the assembly method.
The positive and negative signs of the SMD LED are as follows:
According to the type of illumination, it can be further divided into a common monochromatic light emitting diode, a high brightness light emitting diode, a color changing light emitting diode, a flashing light emitting diode, a voltage controlled light emitting diode, an infrared light emitting diode, and the like.
2.2.1 ordinary monochrome light-emitting diode
Ordinary monochromatic light-emitting diodes have the advantages of low volume, low working voltage, uniform and stable operating current, fast response, fast response, long life, etc., and can be driven by various DC, AC, pulse and other power sources. It belongs to a current-controlled semiconductor device and needs to be connected in series with a suitable current limiting resistor.
The color of the illumination of a conventional monochromatic LED is related to the wavelength of the illumination, which in turn depends on the semiconductor material used to fabricate the LED. The wavelength of the red LED is generally 650~700nm, the wavelength of the amber LED is generally 630~650nm, the wavelength of the orange LED is generally 610~630nm, the wavelength of the yellow LED is about 585nm, and the wavelength of the green LED. Generally it is 555~570nm.
Commonly used domestic ordinary monochromatic light-emitting diodes are BT (factory standard model) series, FG (partial model) series and 2EF series. Commonly used imported ordinary monochromatic light-emitting diodes are SLR series and SLC series.
2.2.2 high brightness LED
High-brightness monochromatic light-emitting diodes and ultra-high-brightness monochromatic light-emitting diodes use semiconductor materials different from ordinary monochromatic light-emitting diodes, so the intensity of light emission is also different. Generally, high-brightness monochromatic light-emitting diodes use materials such as gallium arsenide (GaAlAs), ultra-high-brightness monochromatic light-emitting diodes use materials such as phosphorus indium gallium arsenide (GaAsInP), and ordinary monochromatic light-emitting diodes use gallium phosphide (GaP). ) or materials such as phosphorus gallium arsenide (GaAsP).
2.2.3 color changing LED
A color-changing light-emitting diode is a light-emitting diode that can change the color of the light. Color-changing LEDs can be divided into two-color LEDs, three-color LEDs, and multi-color LEDs (red, blue, green, and white).
The color-changing LEDs can be divided into two-terminal color-changing LEDs, three-terminal color-changing LEDs, four-terminal color-changing LEDs and six-terminal color-changing LEDs according to the number of pins.
Commonly used two-color LEDs are 2EF series and TB series. Commonly used three-color LEDs are 2EF302, 2EF312, 2EF322 and other models. Long use
2.2.4 Voltage Controlled Light Emitting Diode
Ordinary light-emitting diodes are current-controlled devices that require a series-connected current-limiting resistor in series. The voltage-controlled light-emitting diode (BTV) integrates the light-emitting diode and the current limiting resistor into one body, and can be directly connected to both ends of the power supply when used.
2.2.5 infrared light-emitting diode
Infrared light-emitting diodes, also called infrared light-emitting diodes, are light-emitting devices that can directly convert electrical energy into infrared light (invisible light) and can be radiated out. They are mainly used in various light control and remote control transmitting circuits.
The structure and principle of infrared light-emitting diodes are similar to those of ordinary light-emitting diodes, except that the semiconductor materials used are different. Infrared light-emitting diodes are usually made of materials such as gallium arsenide (GaAs) or gallium arsenide (GaAlAs) and are packaged in a completely transparent or light blue or black resin.
Commonly used infrared light-emitting diodes are SIR series, SIM series, PLT series, GL series, HIR series and HG series, etc.
--Shenzhen Toplight lighting Co. Ltd.(led tube light/LED linear light
/led high bay light/led tri-proof light/Toplight/Toplight Lighting)