Practical operation tells you the difference between 365nm and 395nm of purple light beads
I believe that many flashlight users are familiar with the purple light flashlight. The functions of 365nm and 395nm lamp beads are also different.
The light emitted by 365nm basically does not contain purple, which does not affect the judgment. The purple at 395nm is very strong, which sometimes affects judgment.
The fluorescence of 365nm is generally much stronger than that of 395nm; the fluorescence effect of 395nm is weaker than that of 365nm.
365nm can emit some fluorescence that cannot be illuminated by 395nm, such as the fluorescence on the back of Renminbi
The left side of the picture below is the color of a 365nm purple light bead shining on a non-fluorescent white object, and the right side is the effect of a 395nm purple light flashlight.
purple light beads
There are many welding methods for LED lamp beads on the chip, and the following is one of the commonly used methods for reference. First, use an electric soldering iron to heat some soldering tin on the positive and negative electrode pads of the lamp bead (the soldering tin must not be too much, otherwise, the positive and negative electrode pads will be connected once heated with a hot-air gun), then use a hot-air gun to heat the positive and negative electrode pads at the same time, after the tin melts, use tweezers to place the positive and negative electrodes of the lamp bead on the corresponding pad.
LED is the light emitting diode, which is a semiconductor solid light emitting device that converts electric energy into light energy. Its core is the PN junction. In addition to the forward conduction, reverse cut-off and breakdown characteristics of the general PN junction, it also has the light emitting characteristics under certain conditions. Its structure mainly includes the following parts: lead, bracket, encapsulation glue, bonding wire, LED chip, solid crystal glue and phosphor. The discoloration failure of LED lamp bead is closely related to its material, structure, packaging process and service conditions. The following will analyze the causes of its discoloration through specific cases.
LED lamp beads are also called light emitting diodes. It has a wide range of applications. Its luminous colors include red light, emerald green light, yellow green light, yellow light, purple light, blue light, white light and orange light. The above is monochromatic light. It can also be made into two or three colors.
The gold wire used to package LED lamp beads contains more than 99.99% gold. It is produced by drawing gold from this material. In addition to 99.99% gold, this gold also contains less than 1% other trace elements. One of the core components of LED lamp bead packaging is gold wire, which is the bridge connecting the luminous chip and the welding point, and plays a decisive role in the service life of LED lamp bead. So how to identify the purity of gold thread?