Design of binder-free phosphor paste for warm white LEDs
Abstract
Cerium-doped yttrium aluminum garnet (YAG: Ce) is used to convert blue light which is emitted from InGaN-based LED chip for white light. In this study, the phosphor paste was prepared using monodispersed spherical YAG: Ce phosphor synthesized by co-precipitation based on one-pot synthesis. Also, orange-red emitting Sr2Si5N8:Eu2+ (SSN: Eu) phosphor was added to confirm the change in optical characteristics. Alpha terpineol was used as a paste solvent because it enabled easy screen-printing. Phosphor paste films for optoelectronic devices were prepared by coating on a glass substrate using a doctor blade method. We compared the conversion efficacy, color rendering index (CRI), and correlated color temperature (CCT) of YAG: Ce which is added to various amounts of SSN: Eu. We measured scanning electron microscopy (SEM) images to confirm the difference of porosity between, depending on binder addition.
- Publication:
-
Optical Materials
- Pub Date:
- October 2018
- DOI:
- 10.1016/j.optmat.2018.06.042
- Bibcode:
- 2018OptMa..84..184K
- Keywords:
-
- Light emitting diode;
- Y<SUB>3</SUB>Al<SUB>5</SUB>O<SUB>12</SUB>: Ce<SUP>3+</SUP>;
- Sr<SUB>2</SUB>Si<SUB>5</SUB>N<SUB>8</SUB>: Eu<SUP>2+</SUP>;
- General illumination;
- Phosphor paste