We believe that the W-class power LED
lighting products to achieve the industrialization must also address
the following technical issues: 1. Powder coating volume control: LED
chip + phosphor coating process used in most common methods is to use
phosphor mixture with the plastic divider be coated to the chip. In the
operation, due to the viscosity of plastic carrier is a dynamic
parameter, phosphor is larger than the proportion of plastic carrier,
as well as distributor accuracy resulting from precipitation and other
factors, this process is the amount of phosphor coating uniformity
control difficult, leading to the white color uneven. 2. Films with
optical parameters: the characteristics of semiconductor process and
decided to silicon wafer with the same kinds of materials that may
exist between all the optical parameters (such as wavelength, light
intensity) and electrical (such as forward voltage) parameters were not
different. RGB three color chips is even more so, for the white color
parameters of significant influence. This is the industrialization of
key technologies must be addressed as one. 3. According to application
requirements generated by light color parameter control: different uses
of products, for white LED color coordinates, color temperature, color
rendering, optical power (or light intensity) and the spatial
distribution of light requirements are different. The control of these
parameters related to product structure, process methods, materials and
other factors, co-ordination.
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