Today, let's talk about what bad situations are prone to occur in 0603 high-brightness SMD LED lamp beads (light-emitting diodes)? First of all, let's take a brief look at the 0603LED lamp bead, its size is: 1.6*0.8*0.4mm. Encapsulated with high-definition environmentally friendly silicone and brand chips, Hongfucheng Optoelectronics 0603 SMD LED lamp beads can be customized in various colors such as white, red, yellow, green, orange, blue, and purple. It can be used in all kinds of home appliances, digital, communications, automotive electronics, lighting, electronic toys, electronic clocks, traffic instructions, medical beauty equipment, electronic teaching equipment, urban lighting and so on.

       Next, we will analyze the bad conditions of these inferior 0603 SMD LED lamp beads, and the reasons for the bad.

       (1) Dead light (the positive and negative poles of the LED are connected to the standard voltage, the light does not light or is slightly bright), there are many reasons for the dead light, which are more complicated, mainly from the perspective of static electricity and packaging.

        (2) Color shift (refers to the error between the white light emitted by the LED and the standard color temperature, and the error value is greater than 10%), the reason is poor heat dissipation, which makes the junction temperature of the 0603LED lamp beads too high; the application of phosphors is uneven, The color temperature of the part with thick coating is low and easy to turn yellow; the quality of phosphor is not good; the proportion of glue powder is not properly allocated, etc.

        (3) The light flickers (the LED light turns on and off intermittently without human control), the reason is that the driving power supply is unstable and there is intermittent current; there is also the deformation of the packaging materials such as the lens, which makes the gold wire in poor contact .

(4) The luminous decay is large (after the LED has been used for a certain period of time, the luminous flux of the test is significantly smaller than the luminous flux before use, and the ratio of the two is less than 0.9), which is caused by poor heat dissipation, and long-term overheating leads to the aging of 0603LED lamp beads; rubber powder ratio improper.

(5) The chip fails, and the chip itself has quality problems (cracks or damage); the chip and the substrate are poorly bonded, causing serious light decay or dead light.

(6) Improper packaging process, poor quality of the packaged lamp beads, yellowing, bubbles, black spots, corrosion, etc.; thermal overstress failure, poor heat dissipation, resulting in a rise in junction temperature; electrical overstress failure, overcurrent or static electricity The chip is broken down; the drive power supply is unstable and the gold wire is blown. Assembly failure, poor installation and assembly lead to device failure.