Unveiling the underlying spin mechanism in quasi-2D perovskite spin-polarized lasing.

Suppressing fast spin relaxation in PEA- and NMA-based quasi-2D perovskites enables spin-polarized lasing below 200 K with a 30.2% lower threshold than linearly polarized excitation.

• Why it matters: Spin-polarized lasing in quasi-2D perovskites is limited by a SOC-related trade-off: strong spin injection competes with short spin lifetimes, preventing sustained spin polarization in the lasing regime.
• What they did: The study identifies Bir-Aronov-Pikus (BAP) as the dominant spin relaxation mechanism and regulates triplet excitons via organic cations (PEA and 1-naphthylmethylamine) to shift relaxation toward D’yakonov-Perel’ (DP).
• The result: With triplet exciton regulation, the DP-linked spin lifetime reaches 35.4 ps at 77 K (about 5× the BAP-induced value), supporting spin-polarized lasing below 200 K.

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