Confocal mapping of stable room-temperature emission centers in gadolinium doped vacancy-ordered double halide perovskite, Gd:Cs2SnCl6

Bandgap Engineering through Fe Doping in Cs2SnCl6 Perovskite: Photoluminescence Characteristics and Electronic Structure Insights

“…Usually the dopant molecule can create new emission centers that lead to the formation of a second emission peak in the UV, visible, and IR region. But in the case of Fe-doped Cs 2 SnCl 6 we are unable to get the second emission peak which might be due to the weak exciton energy transfer from the host to the dopant molecule. − When stimulated at 360 nm, Cs 2 SnCl 6 exhibits single emission peak at 440 nm . The emission at 440 nm is asymmetric and has an absorption tail in the long wavelength region, indicating that it is caused by defect states rather than free excitons …”

“…The color purity of the synthesized phosphors is also a crucial characteristic. Color purity is another important factor and can be determined using the following formula: ,, color purity = false( x − x normali false) 2 + false( y − y normali false) 2 false( x normald − x normali false) 2 + false( y normald − y normali false) 2 × 100 % Here, ( x , y ) are sample point coordinates, ( x d , y d ) are dominant wavelength coordinates, and ( x i , y i ) are illuminant coordinates point. This empirical evidence strongly supports the previously estimated coordinates and affirms the inherent deep blue characteristic of the optimized Fe-doped perovskite under investigation.…”

Investigation on structure and photoluminescence properties of Ho3+ doped Ca3(VO4)2 phosphors for luminescent devices

“…Wide-band gap materials typically have band gaps greater than 3 eV and are known for their suitability in applications where higher-energy photons, such as ultraviolet and blue light, are involved. 43 This means that the material can absorb and emit light in the UV and visible regions of the electromagnetic spectrum.…”

Band gap engineering and photoluminescence tuning in halide double perovskites

“…Various dopants are employed to achieve efficient broadband emission either through breaking of wavefunction parity or through introducing new luminescence centers in the HDP matrix. 27–36 The effects of common dopants, such as transition metals (TM), rare-earth metals (RE), elements with n s 2 electron configuration and the different combinations of them, are reviewed in this paper.…”