Translated Abstract
As a new type of gas discharge light-emitting device, dielectric barrier discharge type flat fluorescent lamp (FFL) has good prospects for development in the applications of special lighting sources, decorative lighting sources and liquid crystal display backlight. Increasing the brightness and luminous efficiency is the most urgent task for the development of mercury-free dielectric barrier discharge type flat fluorescent lamp. In our research, we mainly focus on spectrum emission properties of FFL, which is of great significance to improve the performance of planar light source, so as to promote its practical application.We study how the discharge gas and driving voltage parameters affect FFL spectrum emission properties and how discharge gas affects FFL electrical-optical property. On the spectrum emission properties of FFL, we measure the vacuum ultraviolet (VUV) and infrared (IR) emission spectrum distribution at various discharge gas and driving voltage parameters with a vacuum monochromator and a photomultiplier tube, and analyze the effect of mixed gas pressure, Xe content, He addition, driving voltage amplitude and pulse frequency on main spectrum emission intensity. On the electrical-optical properties of FFL, we apply photometer, single phase power analyzers and oscillograph in measuring how the luminance and driving voltage parameters change along with the changing of mixed Ne-Xe gas pressure while the content of Xe is changeable each time. We also analyze how Xe content and gas pressure affect FFL luminance and luminous efficiency.The experiment results show that as the total gas pressure increases, the 147 nm emission intensity gradually decreases, while the emission intensity of 173 nm increases rapidly, which causes the total intensity of VUV emission increases. As the content of Xe increases from 10% to 30%, the total VUV emission intensity increases rapidly the addition of He can cause not only the 147 nm and 173 nm but also the total VUV emission intensity to increase rapidly under the same gas pressure. As the driving voltage increases, there exists a tendency that the VUV emission increases integrally. When the total gas pressure is set at 70 kPa, the spectrum intensities of VUV emission increase rapidly as the driving pulse frequency increases from 50 kHz to 130 kHz at the very beginning, and then it tends to saturate at 90 kHz. As the driving voltage increases, the IR spectrum increases integrally. The emission efficiency of both 823 nm and 828 nm increase, but the increasing extent of 823 nm is bigger than 828 nm. The electrical-optical property experimental results show that the the ratio of Xe gas and total gas pressure have great influence on the brightness and efficiency of emitted light. Ne-Xe (30%) has maximum brightness and light efficiency which are 6785 cd/m2 and 23.42 lm/W respectively with the pressure set at 50 kPa.This paper reveals the rules of how the gas pressure, the composition of inert gas and the driving voltage parameters of the dielectric barrier discharge type flat fluorescent lamp affect the spectrum radiative properties and the optical-electrical characteristic, so as to provide a solid theoretical basis for the optimization of the mixed gases and driving voltage parameters of FFL.
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