1：Experimental Design and Method Selection:

The study involved designing LSCs with two geometries: planar devices (p-LSCs) using glass containers and cylindrical devices (c-LSCs) using bundles of hollow-core plastic optical fibers filled with R-PE aqueous solutions. A Monte Carlo ray-tracing approach was used for simulations.

2：Sample Selection and Data Sources:

R-PE was extracted from Gracilaria sp. algae using a solid-liquid extraction method with water and ammonium sulfate precipitation. Solutions with concentrations from

3：4×10?? to 17×10?? M were prepared. List of Experimental Equipment and Materials:

Equipment included a UV-Vis spectrometer (Lambda 950, Perkin-Elmer), spectrofluorimeter (Fluorolog-3, Horiba Scientific), absolute quantum yield system (C9920-02, Hamamatsu), refractometer (Abbemat 200, Anton Paar), solar simulator (model 10500, Abet Technologies), monochromator (Triax 180, Horiba Scientific), sourcemeter (2400 SourceMeter, Keithley), calibrated photodiode (FDS1010, Thorlabs), centrifuge (Heraeus Megafuge 16 R, Thermo Scientific), incubator (IKA KS 4000 ic control), and UV-Vis microplate reader (Synergy HT, BioTek). Materials included Gracilaria sp. algae, ammonium sulfate, commercial R-PE standard (Sigma-Aldrich), hollow-core PMMA optical fibers, glass cuvettes (CM Scientific), and polymeric resin NOA

4：Experimental Procedures and Operational Workflow:

R-PE extraction involved homogenizing algae in water, centrifugation, and precipitation with ammonium sulfate. LSCs were fabricated by filling fibers or cuvettes with R-PE solutions, sealing edges, and assembling bundles. Optical characterizations (absorption, emission, quantum yield, refractive index) and performance measurements (η_opt, PCE, EQE) were conducted under AM

5：5G radiation. Data Analysis Methods:

Data were analyzed using Beer-Lambert law for extinction coefficients, Monte Carlo simulations for η_opt predictions, and statistical methods for error calculation. Equations for η_opt, PCE, and EQE were applied as defined in the paper.