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In this study, by screening and comparing the cathode materials and structures, we propose a high-brightness, low-energy-spread Au needle nanocold-cathode point electron source adapted to low-intensity photoelectric coexcitation. The experimental results demonstrate sensitivity to excitation light and outstanding electron emission performance of this point electron source: under the coexcitation of an electrostatic field below \u223c1.25 V \u03bcm\u20131 and a supercontinuum-spectrum laser with average intensity of \u223c24 W cm\u20132, the source achieved an emission current of 130 nA, improving by one order of magnitude when compared to the field emission current (\u223c13 nA) under pure electrostatic field excitation. As the laser excitation intensity increased, its effective work function decreased from 5.1 to 2.7 eV, resulting in a significant reduction of the excitation threshold for electron emission. Benefiting from the plasmon-enhanced light-harvesting effect, the cathode exhibits high sensitivity and selectivity to the wavelength and polarization of the incident light. In the 532\u2013675 nm plasmon resonance band, the emission current exceeds 225 nA at an average excitation intensity of only 7.05 W cm\u20132, \u223c17 times the pure electrostatic field emission current. Meanwhile, the plasmon relaxation preferentially populates high-energy electrons and suppresses the energy spread broadening induced by the space charge effect, thereby achieving a high reduced brightness of 6.89 \u00d7 109 A m\u20132 sr\u20131 V\u20131 and a low-energy spread of approximately 0.5 eV. This low-power photoelectric coexcitation scheme greatly relaxes the requirements on the excitation source, providing a route for the miniaturization and integration of vacuum optoelectronic point electron sources.<\/jats:p>","DOI":"10.1021\/acsami.6c15783","type":"journal-article","created":{"date-parts":[[2026,10,23]],"date-time":"2026-10-23T02:02:02Z","timestamp":1792720922000},"source":"Crossref","is-referenced-by-count":0,"title":["A High-Brightness, Low-Energy-Spread Au Needle Point Electron Source Nanocold-Cathode Adapted to Low-Power Photoelectric Coexcitation"],"prefix":"10.1021","author":[{"given":"Qixin","family":"Lu","sequence":"first","affiliation":[{"name":"Sun Yat-sen University , , ,","place":["Guangzhou, China, 510275"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zheyu","family":"Song","sequence":"additional","affiliation":[{"name":"Sun Yat-sen University , , ,","place":["Guangzhou, China, 510275"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tao","family":"Cui","sequence":"additional","affiliation":[{"name":"Sun Yat-sen University , , ,","place":["Guangzhou, China, 510275"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhe","family":"Liu","sequence":"additional","affiliation":[{"name":"Sun Yat-sen University , , ,","place":["Guangzhou, China, 510275"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yuyue","family":"Ding","sequence":"additional","affiliation":[{"name":"Sun Yat-sen University , , ,","place":["Guangzhou, China, 510275"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shuai","family":"Tang","sequence":"additional","affiliation":[{"name":"Sun Yat-sen University , , ,","place":["Guangzhou, China, 510275"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8362-5871","authenticated-orcid":true,"given":"Yu","family":"Zhang","sequence":"additional","affiliation":[{"name":"Sun Yat-sen University , , ,","place":["Guangzhou, China, 510275"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4699-009X","authenticated-orcid":true,"given":"Huanjun","family":"Chen","sequence":"additional","affiliation":[{"name":"Sun Yat-sen University , , ,","place":["Guangzhou, China, 510275"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1830-2026","authenticated-orcid":true,"given":"Shaozhi","family":"Deng","sequence":"additional","affiliation":[{"name":"Sun Yat-sen University , , ,","place":["Guangzhou, China, 510275"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7357-5716","authenticated-orcid":true,"given":"Yan","family":"Shen","sequence":"additional","affiliation":[{"name":"Sun Yat-sen University , , ,","place":["Guangzhou, China, 510275"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"316","published-online":{"date-parts":[[2026,10,23]]},"reference":[{"key":"2026102222015788600_cit1","doi-asserted-by":"publisher","DOI":"10.1002\/adma.201805845","article-title":"Ultrafast Field-Emission Electron Sources Based on Nanomaterials","volume":"31","author":"Zhou","year":"2019","journal-title":"Adv. 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