Table 1.

Optical properties of Cs₃Cu₂ X ₅ (X = Cl, Br, I) NCs at room temperature

Nanocrystals	Abs. [nm]	PL peak [nm]	FWHM [nm]	Stokes shift [nm]	τave. [µs]	PLQY
Cs3Cu2Cl5	282	520	106	238	95.79	46.2%
Cs3Cu2Br5	267	495	101	228	16.36	3.9%
Cs3Cu2I5	284	445	80	161	1.92	73.7%