There are three main way to achieve white LED lights, but they do not fully mature, thus seriously affecting the white LED lighting in the area. Specifically, the first method is the yellow phosphor coating a blue LED chip to be Blu-ray excitation, chips issued by the yellow light emitted by blue phosphor complementary form white light. The technology monopoly of Japan’s Nichia Corporation, and a schematic of the shortcomings of this program is that the emission spectra of Ce3 + ions in the phosphor does not have a continuous spectrum characteristic color less difficult to meet the low color temperature lighting requirements, while light efficiency is not high enough, the need to improve through the development of new highly efficient phosphor.
The second method is the blue LED chip coated green and red phosphors, issued through the chip emits blue light phosphor green and red composite to get the white color. However, this method used in the phosphor conversion efficiency lower the efficiency of red phosphors need a more substantial increase.
The third method is the three primary colors or multiple color phosphor coating in the violet or ultraviolet LED flood lights chip, the chip launch of the long-wave ultraviolet light (370nm-380nm) or violet (380nm-410nm) to excite the firefly light powder to achieve white light emission.
For LED phosphors
Way to achieve white LED, the most widely used most mature a smear a layer of yellow phosphor on blue chips, blue and yellow mixed into white light, so the material of the phosphor for white LED The attenuation of a great impact.
Market the most mainstream of the phosphor is a YAG (yttrium aluminum garnet) phosphor, silicate phosphor, nitride phosphor with blue LED
Chip compared to the accelerated aging of white LED phosphors, and different manufacturers phosphor light decay is not the same degree of influence, which is closely related to the raw material composition of the phosphor. The Intematix white phosphor, so make a white LED compared to counterparts in the attenuation control has been greatly improved.
The LED phosphors with plastic steps
LED phosphors with plastic program is a part of the LED tubes production process is very important!
Preparatory work:
An open and inspect all of the LED production and use of equipment
With acetone to clean the small beaker with plastic.
Preparing the necessary production specifications book or contact list, and the corresponding model glue, etc and confirm its effective use during the period.
Start with the glue:
1, with a rubber order: Yue He agent + A glue mixed in proportion to the results and then join the proportion of mixed objects of the fluorescent powder + B glue. Then vacuum.
2, according to the ratio of the phosphor and production quantities of the production specifications or engineering notice to calculate the weight of various materials required.
3, adjusting the precision electronic four base electronic horizontal state.
4, a clean small beaker placed on a precision electronic scales to estimate E, according to production specifications book, the ratio of the phosphor, respectively, said fluorescent powder to take the weight required and A, B glue.
5, with a good manual mixing of the fluorescent powder ranging from 20-30 minutes, until the phosphor powder is evenly distributed.
6, with good fluorescent plastic vacuum to the invisible bubble of the state, after taking out on the room temperature with a clean glass cover use, prior to use basis having the same direction, slowly stir for 2 minutes to 3 minutes, stirring speed r 2-3 seconds.