Formation of coated phosphor layers by rotation-revolution for remote-phosphor LED bulbs and characterization of LED light bulb with super high color rendition

Hiroyasu Kondo, Hiroyasu Ishikawa

研究成果: Article査読

抄録

We have developed a new system for coating phosphor globes used in remote-phosphor-type light-emitting diode (RP-LED) bulbs. The system has a rotation-revolution coating apparatus and a heating unit. After dispensing a phosphor slurry mixed with phosphor powder and silicone resin into globes, the phosphor slurry is uniformly coated on the entire inner surface of the globes by the coating system. The phosphor slurry is then cured. We obtained phosphor globes having a phosphor layer with a uniform thickness on the entire inner surface of the globes. We prepared RP-LED bulbs combined with an LED chip-on-board (COB) that emitted light with a wavelength of 400 nm, and phosphor globes containing red, green, and blue phosphor powders obtained using the coating system. The bulbs have a high color rendering because their spectrum is almost the same as that of blackbody radiation. The RP-LED bulbs having a phosphor layer with uniform thickness had more uniform chromaticity and luminescence distribution than an RP-LED bulb having a phosphor layer with nonuniform thickness. The total luminous flux of the RP-LED bulbs was 29% higher than that of a bulb mounted on a COB covered with a phosphor layer. Furthermore, the semiangle at half-power of the RP-LED bulbs was much larger than that of the bulbs mounted on a COB with a phosphor layer.

本文言語English
論文番号8408826
ページ(範囲)2021-2029
ページ数9
ジャーナルIEEE Transactions on Components, Packaging and Manufacturing Technology
8
11
DOI
出版ステータスPublished - 2018 11 1

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 産業および生産工学
  • 電子工学および電気工学

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