Ultrapure green light emission in one-dimensional hybrid lead perovskites: achieving recommendation 2020 standard

An ultrapure green phosphor with narrow emission range (525-535 nm) and full width at half maximum (FWHM < 25 nm) is critical for a backlit light-emitting diode to realize an ultrawide color gamut in liquid-crystal display (LCD), according to the Rec. 2020 standard. However, it is extremely formidable to achieve this goal for low-dimensional halide perovskites (LDHPs), which readily display broadband emissions arising from self-trapped excitons due to strong electron-phonon coupling. Herein, we report a new one-dimensional (1D) hybrid lead halide of [TMPDA] 2 Pb 3 Br 10 (TMPDA = tetramethyl-1,3-diaminopropane) displaying unusual ultrapure green light emission. Benefiting from the synergistic work of weak electron-phonon interaction and strong quantum confinement, this 1D halide displays sharp green emission at 526 nm with narrow FWHM (25 nm), high photoluminescence quantum yield (71.95%) and color purity (91.1%), which achieves the Rec. 2020 standard and represents the purest green emitting LDHP to date. Remarkably, as a down-conversion green phosphor, [TMPDA] 2 Pb 3 Br 10 provides an ultrawide color gamut covering 121.5% of NTSC and 90.7% of Rec. 2020 standards, showcasing the application in high-resolved LCD. The establishment of a fundamental structure-property relationship also paves a new way to rationally design novel narrow-band emitting LDHPs as a supplement of colloidal 3D perovskite nanostructures. New 1D halide of [TMPDA] 2 Pb 3 Br 10 displays a sharp green light emission at 526 nm with FWHM of 25 nm, PLQY of 71.95% and color purity of 91.1%, which achieves the Rec. 2020 standard, and represents the purest green light emitting 1D halide up to date.