Table 1 Optimized lattice parameters and volumes of X-FPEA2PbI4 (X = p, m, and o).

From: 2D Ruddlesden–Popper X-FPEA2PbI4 perovskites for highly stable PeLED with improved opto-electro-mechanical properties

2D Perovskite materials

Lattice parameters (Ǻ)

Volume (Ǻ3)

p-FPEA2PbI4

a = 16.718, b = 8.668, c = 8.803, α = γ = 90°, β = 101.521°

1275.657

m-FPEA2PbI4

a = 16.828, b = 8.755, c = 8.752, α = γ = 90°, β = 100.456°

1289.424

o-FPEA2PbI4

a = 16.847, b = 8.666, c = 8.846, α = γ = 90°, β = 99.851°

1291.481

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