研究目的
Developing a highly efficient, durable, robust, and cost-effective general light source using field emission cathodoluminescent bulbs with carbon fiber cathodes, suitable for standard lighting fittings and insensitive to ambient temperature.
研究成果
The developed cathodoluminescent bulb prototypes demonstrate feasibility for general lighting, offering instant switch-on, no heating power consumption, long service life (over 10000 hours), and operation over a wide temperature range (-50 to 100 °C). Luminous efficiency of 30-50 lm/W and CRI up to 80 are achieved, with potential for improvement to 110 lm/W. The use of carbon fiber field emission cathodes and minimal rare-earth elements makes them cost-effective and environmentally friendly. Future work should focus on optimizing luminophore compositions and scaling production for commercial viability.
研究不足
The prototypes have limited luminous efficiency (30-50 lm/W) compared to potential higher efficiencies (up to 110 lm/W mentioned as possible). Color rendering index (CRI) ranges from 50 to 80, which may not be optimal for all lighting applications. The use of specific luminophores and carbon fiber cathodes may impose constraints on scalability and cost-effectiveness in mass production. Ambient temperature range is specified from -50 to 100 °C, but higher temperatures or extreme conditions were not tested.
1：Experimental Design and Method Selection:
The experiment involves designing and manufacturing a prototype cathodoluminescent bulb with a field emission cathode based on carbon fiber, using a triode scheme with cathode, modulator, and anode. A high-frequency AC-DC converter is employed to generate high voltage for electron emission and luminescence.
2：Sample Selection and Data Sources:
Prototypes are developed with various luminophore compositions to test performance metrics such as luminous flux, efficiency, color temperature, and CRI. The cathode is made from specifically treated carbon fiber, and the luminophore screen is created using settling technology.
3：List of Experimental Equipment and Materials:
Equipment includes a high-voltage power supply source, vacuum system with getters to maintain vacuum at 10-6 Torr, and standard E27 cap. Materials include carbon fiber for the cathode, luminophores (e.g., ZnS-based phosphor of P4 type), aluminum for the anode mirror, and glass for the envelope.
4：Experimental Procedures and Operational Workflow:
The bulb is assembled with the cathode-modulator unit and anode. High voltage is applied (anode up to +20 kV, cathode up to -4 kV, current around 1 mA) to emit electrons, which strike the luminophore to produce light. The built-in converter handles AC line voltage conversion. Vacuum is maintained using getters.
5：Data Analysis Methods:
Performance is evaluated by measuring luminous flux (200-400 lm), luminous efficiency (30-50 lm/W), color temperature (2500-5000 K), CRI (50-80), and service life (not less than 10000 hours). Spectral analysis is conducted to determine chromaticity coordinates and efficiency.
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