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<p>An electron source with high performance and low vacuum compatibility is urgently in demand for the electron-beam instruments. However, there exists compromise between high brightness, small&#xa0;energy spread, and low vacuum for the commercial electron sources. To overcome this challenge, here we use a self-heating effect to stabilize the single-crystalline LaB<sub>6</sub> nanoneedle point field emitter under low vacuum. An ultrahigh reduced brightness of 10<sup>12</sup> A/m<sup>2</sup>/sr/V which is three orders of magnitude higher than commercial W field emitter and with monochromatic energy spread of 0.5 eV were calculated at a large current of 2 μA, showing a stable emission with fluctuation of 3.4%/hour in a low vacuum at 7 × 10<sup>−6</sup> Pa which is three orders of magnitude lower than the operating environment of commercial W field emitter. The ultrahigh brightness and small energy spread are attributed to the sharp, robust structure and low work function of LaB<sub>6</sub> nanoneedle made by focused ion beam.</p><p></p>

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Ultrabright LaB6 nanoneedle field emission electron source with low vacuum compatibility

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年7月2日

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  • Mingkai Gou,
  • Shuai Tang,
  • Kai Huang,
  • Haokun Guan,
  • Runze Zhan,
  • Chaolun Liang,
  • Chengcheng Chen,
  • Yan Shen,
  • Shaozhi Deng

摘要

An electron source with high performance and low vacuum compatibility is urgently in demand for the electron-beam instruments. However, there exists compromise between high brightness, small energy spread, and low vacuum for the commercial electron sources. To overcome this challenge, here we use a self-heating effect to stabilize the single-crystalline LaB6 nanoneedle point field emitter under low vacuum. An ultrahigh reduced brightness of 1012 A/m2/sr/V which is three orders of magnitude higher than commercial W field emitter and with monochromatic energy spread of 0.5 eV were calculated at a large current of 2 μA, showing a stable emission with fluctuation of 3.4%/hour in a low vacuum at 7 × 10−6 Pa which is three orders of magnitude lower than the operating environment of commercial W field emitter. The ultrahigh brightness and small energy spread are attributed to the sharp, robust structure and low work function of LaB6 nanoneedle made by focused ion beam.