# Quasi-2D perovskite spin-polarized lasing below 200 K achieved with 35.4 ps spin lifetime

- Published: 2026-11-05 22:17 UTC
- Section: Machines & Making › Electronics
- Tags: quasi-2D perovskite, spin-polarized lasing, spin relaxation, Bir-Aronov-Pikus mechanism, D'yakonov-Perel' mechanism, spin lifetime 35.4 ps, triplet excitons, phenylethylammonium, perovskite spintronics
- URL: https://realtech.media/news/rt-ad692d1a4508709f05cf3a2c_quasi_2d_perovskite/

**Authors report spin-polarized lasing in quasi-2D perovskites below 200 K after suppressing fast spin relaxation through triplet exciton regulation in a laboratory experiment.**

![Quasi-2D perovskite spin-polarized lasing below 200 K achieved with 35.4 ps spin lifetime](https://sgzwpqqelzmajkcubgkl.supabase.co/storage/v1/object/public/rt-media/2026/11/ca2e57a67e38c2b2.jpg)
*Physics Department Ateneo de Manila University, Wikimedia Commons, CC BY 2.0*

Researchers reported in Science Advances spin-polarized lasing in quasi-two-dimensional (quasi-2D) perovskites, achieved by suppressing fast spin relaxation through regulation of triplet excitons. According to the authors, lasing was realized below 200 K, and its threshold was 30.2% lower than for linearly polarized excitation [1]. The materials use the organic cations phenylethylammonium (PEA) and 1-naphthylmethylamine (NMA).

Spin-polarized lasers are considered for integrated photonic devices for secure communication, optical interconnections and other optical devices. Quasi-2D perovskites are candidates because their potential structural inversion asymmetry should give strong spin-orbit coupling (SOC), which facilitates spin injection and spin splitting of electronic bands [1].

## Spin relaxation mechanism

Strong SOC involves a trade-off between spin injection and spin lifetimes. This makes it difficult to sustain spin polarization in the lasing regime while keeping optical gain. The authors identified the Bir-Aronov-Pikus (BAP) mechanism as the dominant spin relaxation channel that prevents spin-polarized lasing in quasi-2D perovskites [1].

## Triplet excitons and the result

The authors modulated the reverse intersystem crossing of triplet excitons. As a result, the D'yakonov-Perel' (DP) mechanism began to play the key role, and a new, longer spin lifetime of 35.4 ps appeared at 77 K. This is about five times the lifetime induced by the BAP mechanism [1].

In their conclusion, the authors state that the work underscores the potential of PEA-based quasi-2D perovskites for spin-polarized lasing and contributes to progress in perovskite spintronic devices [1].

## Sources

1. [Science Advances](https://doi.org/10.1126/sciadv.aeg4834)

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Source: RealTech, realtech.media — https://realtech.media/news/rt-ad692d1a4508709f05cf3a2c_quasi_2d_perovskite/