Abstract
In this study, a method realizing real-time color-tunable white light-emitting diodes (LEDs) through the combination of phosphor patterns and adaptive liquid lens is proposed. The phosphor patterns with red ring and yellow ring was fabricated on an Indium Tin Oxides glass (ITO glass) plate by the screen printing process. The ITO glass is set to be the electrode to change the lens shape. And a liquid transparent silicon oil is dispensed around the LED chip as a lens. The phosphor layer plate with the remote arrangement in the LED modules. And an air gap exists between the lens and the phosphor layer. With applying an electric field and the surface tension around the liquid lens, the lens shape would vary into different shapes such as cone or bowl or sandglass and so on. Different lens shapes change the blue light intensity distribution on the ITO glass. Consequently, it results in varying the ratio of absorbed blue light by red phosphor and yellow phosphor and the emission spectra of the LED. The experimental results show that the average correlated color temperature (CCT) can be adjusted from 1928 K to 7260 K. The color rendering index (CRI) keep the value larger than 70 in the whole CCT range. This study has proved that the proposed real-time tunable color method is high-efficiency and practical for developing smart color white LEDs.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
