Perovskite energy funnels for efficient white emission

Facile synthesis of Mn2+ doped ultrathin (n = 2) NPLs and their application in anti-counterfeiting

“…A similar phenomenon has been confirmed by other reports. 20,34,48 Correspondingly, the absorbance peak shows a similar shift (Fig. 2b).…”

“…Both the change of PL intensity and lifetime of the donor indicate that the efficiency of the energy transfer increases with increasing Mn 2+ doping levels. Compared to our previous work, 20 only the source of Mn ions was changed, resulting in the formation of Mn 2+ doped ultrathin NPLs. In the previous work, 20 the Ag-Mn precursor was acquired by dissolving the MnAc 2 and AgAc in the dodecylbenzene sulfonic acid (DBSA) and oleylamine (OLA).…”

“…[1][2][3][4][5][6][7][8][9][10][11][12] Recently, most studies on perovskites have focused on the colloidal perovskite nanomaterials because of the strong quantum confinement effect, good stability over the bulk materials and solution processability. 2,[13][14][15][16][17][18][19][20][21] Compared with 3D perovskite nanocrystals (NCs), 2D perovskite nanoplatelets (NPLs) with thicknesses at the atomic scale have many distinct optical properties including narrow absorption and emission spectra, large exciton binding energies and high absorption crosssections. 4,20,[22][23][24][25][26] These exceptional optical properties are beneficial for application in LEDs and lasers, which is hard to achieve and strongly required in colloidal NCs.…”

“…2,[13][14][15][16][17][18][19][20][21] Compared with 3D perovskite nanocrystals (NCs), 2D perovskite nanoplatelets (NPLs) with thicknesses at the atomic scale have many distinct optical properties including narrow absorption and emission spectra, large exciton binding energies and high absorption crosssections. 4,20,[22][23][24][25][26] These exceptional optical properties are beneficial for application in LEDs and lasers, which is hard to achieve and strongly required in colloidal NCs. 27 2D NPLs can be prepared according to the experience gained through the synthesis of CsPbX 3 NCs.…”

“…[30][31][32][33][34][35][36] Among these, Mn 2+ ion doping has attracted significant attention since the Mn 2+ ions have the same charge to Pb 2+ and they can introduce new 4 T 1 -6 A 1 levels into the host. 20,[32][33][34][37][38][39][40] Compared to the extensive research on Mn 2+ doped CsPbX 3 NCs, Mn 2+ doped NPLs have not been explored widely. This may be attributed to two aspects.…”