| 摘要 |
PROBLEM TO BE SOLVED: To provide a surface light source device which can exhibit improved discharge efficiency. SOLUTION: Dopant in the surface light source device contains 50 ppm or less of moisture, 50 ppm or less of nitrogen, 30 ppm or less of oxygen, 20 ppm or less of carbon monoxide, and 20 ppm or less of carbon dioxide. Thus the surface light source device with the dopant specification above comes to have improved brightness. COPYRIGHT: (C)2007,JPO&INPIT
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