Tuning the Optical Properties of CsPbBr3 Nanocrystals by Anion Exchange Reactions with CsX Aqueous Solution

Table 1 Composition, emission energy, and PLQY of CsPbBr₃NCs exchanged under different conditions

Aqueous solution	Sonication time (min)	EDX composition	PL energy (eV)	PL QYs (%)
1 mol/L CsCl	60	CsPbBr_0.2Cl_{2. 8}	3.04	5
	10	CsPbBr_2.0Cl_1.0	2.74	32
	5	CsPbBr_2.3Cl_0.7	2.62	85
Pristine	0	CsPbBr₃	2.39	76
1 mol/L CsI	4	CsPbBr_2.5I_0.5	2.25	52
	8	CsPbBr_2.2I_0.8	2.03	46
	30	CsPbBr_0.3I_2.7	1.83	31