Full Extraction of 2D Photonic Crystal Assisted <formula formulatype="inline"><tex Notation="TeX">$ \hbox{Y}_{3}\hbox{Al}_{5}\hbox{O}_{12}$</tex></formula>:Ce Ceramic Plate Phosphor for Highly Efficient White LEDs

• Main Authors: Seong Woong Yoon, Hoo Keun Park, Ji Hye Oh, Young Rag Do
• Format: Article
• Language: English
• Published: IEEE 2014-01-01
• Series: IEEE Photonics Journal
• Subjects: Advanced optics design; surface; photonic crystals; engineered photonic nanostructures; light emitting diodes (LEDs)
• Online Access: https://ieeexplore.ieee.org/document/6725599/
• ISSN: 1943-0655

In this paper, we report the optical and thermal effects of filling the air gap between a ceramic plate phosphor (CPP) and a cup-type light-emitting diode (LED) in a white phosphor-converted LED (pc-LED) package. The aim of our work was to improve extraction efficiency fully, as well as to enhance heat dissipation; and in this case, the CPP was a two-dimensional (2D) TiO₂ nanobowl photonic crystal layer (PCL)-assisted Y₃Al₅O₁₂: Ce^{3 +}(YAG: Ce). By adding a 2D TiO₂ PCL and eliminating the air gap between the CPP and the LED cup, our package exhibited better luminous efficacy, more uniform optical properties, and higher thermal conductivity than those of a 2D TiO₂ PCL-assisted CPP-capped LED with an air gap and a conventional phosphor powder dispersed in an LED package.