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Rare Earth-Doped Phosphors for White LEDs Chapter 278 89 Phosphor Silicone binder Formulation mixer Solvent Air pressure Solution disturbing system Air pressure with interval control A B FIG. 79 Schematic diagram of the phosphor coating process. (A) Conventional dispensing and (B) pulsed spray. Reproduced with permission from Huang, H.-T., Tsai, C.-C., Huang, Y.-P., 2010. Conformal phosphor coating using pulsed spray to reduce color deviation of white LEDs. Opt. Exp. 18 Suppl. 2, A201–A206. © 2010 OSA Publishing. between the resin and the reflector is the same as the slanting angle (Zheng et al., 2013). Alternatively, a pulsed-spray process was examined for application of phosphor-containing resin into LED packages (Huang et al., 2010). The process is presented in Fig. 79. The uniformity of color coordinates obtained by this method was better compared to the conventional dispensing process, in partic- ular, the angular distributions of the color coordinates were more stable. 6.3 Chip-on-Board Because high light flux is presently required for lighting devices, chip-on- board (COB) type LEDs have been spreading in the market instead of devices including plenty of SMD packages. A typical structure of COB is illustrated in Fig. 80. The structure of the COB involves many LED chips that are mounted directly on a thermal conductive substrate, eg, aluminum or copper. Then, the whole LED chips are covered with an encapsulant doped with the phosphors (Administrator_of_LED_NEWS.ORG, 2013; Keeping, 2014). Using the COB technique avoids mounting SMD packages on the substrate. It is favorable not only from the viewpoint of the production cost but also from the heatPDF Image | HANDBOOK ON THE PHYSICS AND CHEMISTRY OF RARE EARTHS
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