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Discharge and photo-luminance properties of a parallel plates electron emission lighting device

Chia-Hung Li, Ming-Chung Liu, Chang-Lin Chiang, Jung-Yu Li, Shih-Pu Chen, Tai-Chiung Hsieh, Yen-I Chou, Yi-Ping Lin, Po-Hung Wang, Ming-Shin Chun, Hui-Kai Zeng, and Jenh-Yih Juang

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Abstract

The gas discharge and photo-luminance properties of a planar lighting source featuring highly uniform light emission and mercury-free design were studied. The current density-voltage characteristics and the associated gas discharge of the devices operating with the values of the ratio of electric field to gas pressure (E/p) between 4.3 kV/Torr-cm and 35.7 kV/Torr-cm indicate that the width of the cathode fall extends over the entire gap between the two electrodes and the device is mostly in the obstructed discharge regime. The optical emission analysis confirmed the electron collision-induced gas emissions and strong effect of gas pressure on the phosphor emission when operated at constant current density, both are indicative of the primary roles played by the electron energy.

©2010 Optical Society of America

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Figures (4)
Fig. 1
Fig. 1 (a) The current density-voltage characteristics of devices operated at various gas pressures. (○, p = 0.110 Torr; ●, p = 0.130 Torr; □, p = 0.210 Torr); (b) Photo-luminance versus current density (L-J)for the corresponding devices shown in (a).

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Fig. 2
Fig. 2 (Color online) Optical emission spectrum of device operated at a nitrogen pressure of 0.21 Torr (E/p < 10 kV/Torr-cm) with current densities of 0.086 A/m2 (blue dot line), 0.173 A/m2 (red dash line), and 0.268 A/m2 (black solid line), respectively. The inset shows the variations of the emission intensity with current density for 391.5 nm, 427.5 nm, and 530.0 nm emission lines, respectively.

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Fig. 3
Fig. 3 (Color online) Optical emission spectra for devices operated with various gas pressures at a constant current density of 0.086 A/m2. The blue (dot line), red (dash line), and black (solid line) curves are for pressure of 0.110Torr (30 kV/Torr-cm < E/p), 0.130 Torr (20 kV/Torr-cm < E/p < 30 kV/Torr-cm), and 0.210 Torr (E/p <10kV/Torr-cm), respectively. The inset shows an enlarged portion ranging from 380 nm to 400 nm.

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Fig. 4
Fig. 4 The input power dependence of the photo-luminance obtained for a wider range of gas pressures.(X, p = 0.108 Torr; ○, p = 0.110 Torr; ●, p = 0.130 Torr; ▼, p = 0.150 Torr;▽, p = 0.150 Torr; □, p = 0.210 Torr). The inset shows the variation of the luminance with the gas pressure at a constant input power of 0.21 W.

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Equations (2)

Equations on this page are rendered with MathJax. Learn more.

J / p 2 = 2 ε o V k v i ( 1 + γ a p p ) / ( p d k ) 2 ,
K = π   L   A P E ,
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