This PDF file includes:

• Section S1. Material synthesis
• Section S2. Microcavity fabrication
• Section S3. Absorption and photoluminescence
• Section S4. Optical setup
• Section S5. Interaction constant
• Fig. S1. Absorption (blue) and photoluminescence (green) spectra measured on top of a PEAI single crystal with a 488-nm continuous-wave laser.
• Fig. S2. Optical setup used to measure the microcavity sample.
• Fig. S3. Exciton blueshift as a function of exciton density per QW obtained with a linearly polarized laser.
• Fig. S4. Microcavity-embedded single crystal.

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