Figure 11.

a) Schematic of phosphor‐converted LED. b) EL spectrum of the WLED by integrating blue‐emitting Cs₃Bi₂Br₉ NCs and yellow‐emitting rare‐earth phosphor Y₃Al₅O₁₂. Inset: device photos of NCs/silica composites combined with Y₃Al₅O₁₂ (off and on). Reproduced with permission.^{[ 58 ]} Copyright 2017, Wiley‐VCH. c) CIE color coordinates of WLED device combined by Cs₂SnCl₆:2.75%Bi³⁺/Ba₂Sr₂SiO₄:Eu²⁺/GaAlSiN₃:Eu²⁺/365 chip and inset image of operating LED. Reproduced with permission.^{[ 16e ]} Copyright 2018, Wiley‐VCH. d) 365 nm UV pumped single yellow‐emitting (OCTAm)₂SnBr₄ LED and WLED fabricated by (OCTAm)SnBr₄/BaMgAl₁₀O₁₇:Eu²⁺/G2762/365 nm UV chip. Reproduced with permission.^{[ 56 ]} Copyright 2019, Royal Society of Chemistry. e) XRD patterns of a Cs₂Ag_0.6Na_0.4InCl₆ films (top) and powder (bottom). The inset displays a 300 nm thick quartz substrate and 500 nm thick Cs₂Ag_0.6Na_0.4InCl₆ films under the excitation of 254 nm. f) Operational stability of Cs₂Ag_0.6Na_0.4InCl₆ devices, measured in air without any encapsulation. Reproduced with permission.^{[ 60 ]} Copyright 2018, Springer Nature. g) EL spectra of a WLED at different driving currents, the insets show the device when off and on. Reproduced with permission.^{[ 132 ]} Copyright 2018, Royal Society of Chemistry. h) Photograph of Cs₃Cu₂I₅, a yellow phosphor, and its mixtures (from left to right: Cs₃Cu₂I₅, mixture of 2:8, yellow phosphor) under UV excitation (top) and films prepared by kneading the powders into polydimethylsiloxane matrix (bottom). Reproduced with permission.^{[ 61 ]} Copyright 2018, Wiley‐VCH.