Improvement of Luminance and Luminous Efficacy of Mercury-Free, Flat Fluorescent Lamp by Optimizing Phosphor Profile

Author

Seo, In Woo ; Jung, Jae-Chul ; Oh, Byung Joo ; Whang, Ki-Woong

Author_Institution

Dept. of Electr. Eng. & Comput. Sci., Seoul Nat. Univ., Seoul, South Korea

Volume

38

Issue

5

fYear

2010

fDate

5/1/2010 12:00:00 AM

Firstpage

1097

Lastpage

1100

Abstract

A highly efficient mercury-free fluorescent lamp (MFFL) was developed for an alternative to fluorescent lamps containing mercury. The lamp has a simple structure with two main electrodes running parallel to each other and an auxiliary electrode. In order to improve the luminance and luminous efficacy of MFFLs further, we optimized the thickness of rear and front phosphors on the inner surfaces of the lamp, and then adopted an uneven distribution profile for the rear phosphor to increase the surface area of the phosphor. The MFFL with the optimized phosphor profile showed a wide luminance range from 3315 to 17133 cd/m² with the corresponding luminous efficacy from 75.2 to 42.5 lm/W with the color coordinate around (0.32, 0.32) for daylight.

Keywords

brightness; fluorescent lamps; phosphors; auxiliary electrode; color coordinate; flat fluorescent lamp; front phosphor thickness; highly efficient mercury-free fluorescent lamp; inner surfaces; luminance; luminous efficacy; main electrodes; phosphor profile; phosphor surface area; rear phosphor thickness; uneven distribution profile; Dielectric barrier discharge; luminance; luminous efficacy; mercury-free flat fluorescent lamp (MFFL); phosphor application optimization;

fLanguage

English

Journal_Title

Plasma Science, IEEE Transactions on

Publisher

ieee

ISSN

0093-3813

Type

jour

DOI

10.1109/TPS.2010.2043961

Filename

5451130