Effect of high pressure on the emission spectrum of single crystals of Tl[Au(CN)2]

Experimental results for the photoluminescence of Tl[Au(CN)2] single crystals are reported as a function of pressure up to p≈45 kbar at T=60 and 300 K. Pressure-induced red-shifts of the emission energy are Δν̄/Δp=−140 cm−1/kbar (at 60 K) and Δν̄/Δp=−160 cm−1/kbar (at 300 K). These large values are related to the pressure-induced increase of two-dimensional interactions between the [Au(CN)2]− units and to the reduction of the band gap energy.