A lighting mechanism for flat electron emission lamp

The present study concerns with the secondary electron emission coefficient, γ, of the cathode materials used in the newly developed flat electron emission lamp (FEEL) devices, which essentially integrates the concept of using cathode for fluorescent lamp and anode for cathode ray tube (CRT) to obtain uniform planar lighting. Three different cathode materials, namely fluorine-doped tin oxide (FTO), aluminum oxide coated FTO (Al2O3/FTO) and magnesium oxide coated FTO (MgO/FTO) were prepared to investigate how the variations of γ and working gases influence the performance of FEEL devices, especially in lowering the breakdown voltage and pressure of the working gases. The results indicate that the MgO/FTO bilayer cathode exhibited a relatively larger effective secondary electron emission coefficient, resulting in significant reduction of breakdown voltage to about 3kV and allowing the device to be operated at the lower pressure to generate the higher lighting efficiency.

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A study of the flat electron-excited-phosphor dark luminescent lamp

Zhang¹,

Kitsinelis²,

Zissis³

2012

2012 Abstracts IEEE International Conference on Plasma Science

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In this study we test flat electron -excited phosphor (ZnS:Cu,Al+In2O3 -Green) luminescent lamps operated with voltages in the range of 2.5 -5 kV and currents of 0.5 -2 mA. The discharge takes place between two flat transparent film electrodes with 1 cm gap between them. The buffer gas pressure is low (about 17 Pa) and no mercury is employed, which makes the lamp a candidate for future green backlight sources 1 .Traditional discharge lamps work under glow or arc discharge regime, while the lamp we study functions in the regime of Townsend discharge. Visible radiation directly from the gas discharge is quite limited in such high E/N value (~10 5 Td), but the high energy initial and secondary electrons 2 will contribute to the light emission. The main objective of this work is to find the optimum working conditions (including gas species, pressure, voltage and current and so on) for this application.Early measurements show that the geometry and operation of such lamps must be fine tuned in order to reach optimum working conditions where both the entire surface emits uniformly and the light output is stable over time. The phosphor emitting green light has no response to 650 nm and 532 nm photon excitation but could be excited by violet (405 nm) light.Moreover we have investigated the contribution of different buffer gases with different pressures to the overall emission output as we explored the fine and uncharted region between Townsend discharge (electron excitation of the phosphors) and glow discharge (electron impact excitation of the buffer gas) where both mechanisms can contribute to the overall output and controlled for dynamic lighting effects.

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A lighting mechanism for flat electron emission lamp

Cited by 7 publications

References 13 publications

Nickel field-emission microcathode: Art of fabrication, properties, and applications

Nickel field-emission microcathode: Art of fabrication, properties, and applications

Secondary electron emission characteristics of oxide electrodes in flat electron emission lamp

A study of the flat electron-excited-phosphor dark luminescent lamp

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