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Here, we develop a red light source by integrating an Rb\n                    <jats:sub>2<\/jats:sub>\n                    LiGaF\n                    <jats:sub>6<\/jats:sub>\n                    :Mn\n                    <jats:sup>4+<\/jats:sup>\n                    (RLGF:Mn\n                    <jats:sup>4+<\/jats:sup>\n                    ) microcrystal phosphor with a blue InGaN chip to form a narrowband phosphor\u2010converted LED (pc\u2010LED, FWHM = 13.4\u00a0nm) as a replacement for a commercial red module. The crystallized RLGF:Mn\n                    <jats:sup>4+<\/jats:sup>\n                    microcrystals deliver a high external quantum efficiency (EQE = 52%) and enable clearer structure\u2013emission correlation via experimentally resolved dual\u2010site Mn\n                    <jats:sup>4+<\/jats:sup>\n                    emission. The resulting pc\u2010LED exhibits high electro\u2010optical efficiency (\u03b7 = 32.03%) and minimal thermal spectral drift (peak shift \u2264 0.3\u00a0nm from 20\u00b0C\u2013100\u00b0C). Using this narrowband, thermally stable light source in a wearable PPG prototype, we quantitatively demonstrate improved signal quality and more stable VPG\/APG feature localization compared with a commercial red module. Finally, we provide a proof\u2010of\u2010concept demonstration of blood\u2010pressure estimation by lightly training a basic convolutional neural network, achieving mean absolute errors of 2.86\u00a0mmHg for SBP and 2.40\u00a0mmHg for DBP on an independent test set. This work establishes a materials\u2010to\u2010device pathway for improving PPG quality through optical spectral engineering.\n                  <\/jats:p>","DOI":"10.1002\/adma.202521971","type":"journal-article","created":{"date-parts":[[2026,8,7]],"date-time":"2026-08-07T04:03:01Z","timestamp":1786075381000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["High\u2010Quality Photoplethysmography Signal Enabled by Narrowband Red Phosphor Converted Light\u2010Emitting Diodes for Accurate Blood\u2010Pressure Monitoring"],"prefix":"10.1002","volume":"38","author":[{"given":"Renhua","family":"Guo","sequence":"first","affiliation":[{"name":"State Key Laboratory of Luminescent Materials and Devices South China University of Technology  Guangzhou China"},{"name":"Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques, and Guangdong Engineering Technology Research Center of Special Optical Fiber Materials and Devices, South China University of Technology Guangzhou China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Weiyang","family":"Gong","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Luminescent Materials and Devices South China University of Technology  Guangzhou China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1666-0532","authenticated-orcid":false,"given":"Enhai","family":"Song","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Luminescent Materials and Devices South China University of Technology  Guangzhou China"},{"name":"Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques, and Guangdong Engineering Technology Research Center of Special Optical Fiber Materials and Devices, South China University of Technology Guangzhou 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