Method for producing LED by one step film lamination
View Patent ↗The present invention relates to method for producing LED by one step film lamination. The method comprises: laminating two or more LEDs with two or more colored phosphor films by one step film lamination; wherein each of the colored phosphor film comprises each other different colored phosphor composition which has a Maximum tan δ; and the difference of each Maximum tan δ varies within a range of 0-30%. In the present invention, the method for producing a LED may greatly improve production efficiency (i.e., dual and multi-color LEDs in one step) and lower cost of ownership. Further, it may improve uniformity of phosphor dispersion, thereby improve color quality of LEDs.
1. A method for producing LEDs having two or more colors, comprising: curing two or more separate colored phosphor films laminated to each other and to each of two or more LEDs by one heating step;
wherein each of the colored phosphor film comprises each other different colored phosphor composition which has a Maximum tan δ; and
the difference of each Maximum tan δ varies within a range of 0-30% and
wherein the colored phosphor composition comprises a silicone binder.
2. The method according to claim 1 , wherein each of the different colored phosphor composition has a gelling time, and the difference of each gelling time varies within a range of 0-50%.
3. The method according to claim 1 , wherein the difference of each Maximum tan δ varies within a range of 0-15%.
4. The method according to claim 1 , wherein the colored phosphor composition further comprises a cure catalyst and a phosphor; and
the difference of Maximum tan δ is controlled by adjusting a ratio of the catalyst and silicone binder, and/or a ratio of the silicone binder and phosphor.
5. The method according to claim 2 , wherein the colored phosphor composition further comprises a cure catalyst and a phosphor; and
the difference of gelling time and/or Maximum tan δ is controlled by adjusting a ratio of the catalyst and silicone binder, and/or a ratio of the silicone binder and phosphor.
6. The method according to claim 4 , wherein the phosphor is pre-treated with a treatment agent.
7. The method according to claim 6 , wherein the treatment agent is a basic compound.
8. The method according to claim 6 , wherein the phosphor is pre-treated by the following method: (1) contacting the phosphor with treatment agent for a period time so as to ensure a good dispersion of phosphor in the treatment agent; and (2) drying the phosphor coated with the treatment agent, which is ready to be used with the silicone binder.