Table 4 Effective masses, dielectric constants, bandgap energies, dielectric, and exciton binding energies 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

me

mh

mr

ε1

Eg (eV)

Ebx (meV)

p-FPEA2PbI4

0.133

0.162

0.123

4.420

2.097

85.62

m-FPEA2PbI4

0.138

0.169

0.126

4.272

2.133

93.89

o-FPEA2PbI4

0.145

0.178

0.130

4.239

2.177

98.39

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