Shenzhen Crescent Optoelectronic Co., Ltd.
Exhibition
Are SMD LED Beads Environmentally Friendly?
At present, more and more surface mounting device led beads have replaced conservative lighting lamps, and are used in l...
What are the Differences between COB Package and SMD Package in the Field of LED Display?
The existence of double giants in the field of LED display has jointly developed and flourished the LED industry. As a c...

LED Package of Great Significance To LED Bead Quality

Luminescence principle of LED patch bead: the terminal voltage of PN junction forms a potential barrier. When the forward bias voltage is added, the barrier drops, and most carriers in the P and N regions diffuse to each other. Since electron mobility is much larger than hole mobility, a large number of electrons will be diffused to the P region, forming an injection of minority carriers in the P region. These electrons recombine with the holes in the valence band, and the resulting energy is released as light energy. This is the principle of PN junction luminescence.

It is believed that LED package is of great significance to the quality of LED bead:

I. necessity of LED package


The LED chip is just a tiny solid. Its two electrodes are visible under a microscope. In the manufacturing process, besides welding the two electrodes of the LED chip to lead out the positive electrode and the negative electrode, the LED chip and the two electrodes also need to be protected.

Ⅱ. The function of LED package


The development of LED package technology with low thermal resistance, excellent optical properties and high reliability is the only way for the new LED to become practical and enter the market. LED package technology is mostly developed and evolved on the basis of semiconductor separation device packaging technology. The core of the ordinary light-emitting diode is sealed in the package body to protect the chip and complete the electrical interconnection.

Ⅲ. LED package method selection


The photon emitted by the pn junction of the LED is non-directional, that is, it has the same probability to be emitted in all directions, so not all light generated by the chip can be emitted. How much light can be emitted depends on the quality of semiconductor materials, chip structure, geometry, packaging materials and internal materials.
Related News
  • Application of LED

    Application of LED

    January 22, 2019LED lamps are widely used in various indoor and outdoor displays, which are divided into full-color, tri-color and monochrome displays, which has the characteristics of anti-seismic, impact resistance...view
  • SMD LED Color Detection

    SMD LED Color Detection

    March 13, 2019When people face the question of what color is, they always think it is a very simple question. if someone asks the child what color the apple is, the children will say in unison: red. But if you ask ...view
  • Development Status and Trend Analysis of High Efficiency COB LED Light Source

    Development Status and Trend Analysis of High Efficiency COB LED Light Source

    March 13, 2019If patches are the mainstream in 2013, cob packaging will gradually become the mainstream in the market in 2014, with the total output rising by 20% to 30%. Among them, cob packaged bulbs even account...view
  • Discussion on Advantages and disadvantages of High Power LED

    Discussion on Advantages and disadvantages of High Power LED

    January 22, 2019High power LED is one of the most important means to achieve high light flux. There are many advantages and disadvantages to using high-power LED lighting. How to use high-power LED is the key. At the...view