Fig. 1 | Nature Communications

Fig. 1

From: Modulation of recombination zone position for quasi-two-dimensional blue perovskite light-emitting diodes with efficiency exceeding 5%

Fig. 1

Composition engineering for efficient blue emission of perovskite. a Normalized absorption of CsPbClxBr3 − x thin films with different molar ratios of cesium chloride (CsCl) to cesium bromide (CsBr). The results are normalized by the intensity of their corresponding excitonic absorption peaks. b Photoluminescence (PL) spectra of CsPbClxBr3 − x thin films with different molar ratios of CsCl to CsBr. c Trap densities and photoluminescence quantum yields (PLQYs) of CsPbCl0.9Br2.1 thin films with different ratios of phenylethylammonium bromide (PEABr). The trap density was calculated based on the equation Nt = 2ε0εrVTFL/(qL2), and a detailed discussion can be found in Supplementary Figures 3 and 4. d PL spectra of CsPbCl0.9Br2.1 thin films with different ratios of PEABr

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