Vacancy-ordered Te4+-doped Rb2ZrCl6 double perovskite microcrystals for solid-state lighting and non-contact optical thermometry

Abstract

In this work, we prepared the highly efficient yellow light-emitting vacancy-ordered Te4+-doped Rb2ZrCl6 microcrystals (RZCTs) through a hydrothermal method. RZCT with a photoluminescence quantum yield of 34.6% was prepared at Te4+ feeding ratio of 5%. RZCT is used to fabricate high-efficiency white light-emitting diodes, and adjusting the current can realize the transition of cold and warm white light with CIE color coordinates of (0.31, 0.28) and (0.36, 0.37), respectively. It is also applied to non-contact thermometry using photoluminescence lifetime, of which maximum relative and absolute sensitivities were obtained as 0.89% and 4.76 × 10−3 K−1, respectively. The study shows that the lead-free Te4+-doped perovskite microcrystals exist great potential in next-generation solid-state lighting and non-contact optical thermometry.

Spectrally Tunable Lead-Free Perovskite Rb2ZrCl6:Te for Information Encryption and X-ray Imaging

“…Notably, the peak at 575 nm exhibits the highest intensity, corresponding to the 3 P 1 → 1 S 0 triplet energy transition of Te 4+ . The peaks at 380 nm and 455 nm originate from the 1 P 1 → 1 S 0 singlet transition of Te 4+ and the STE emission of Rb 2 ZrCl 6 , respectively [32]. As shown in Figure 2a, the precise control of the Te 4+ doping level allowed for effective spectral tuning can result in the transformation from blue to yellow light emission.…”

“…Notably, the peak at 575 nm exhibits the highest intensity, corresponding to the 3 P 1 → 1 S 0 triplet energy transition of Te 4+ . The peaks at 380 nm and 455 nm originate from the 1 P 1 → 1 S 0 singlet transition of Te 4+ and the STE emission of Rb 2 ZrCl 6 , respectively [ 32 ].…”

“…As depicted in Figure 3 b, under UV excitation of 388 nm, Rb 2 ZrCl 6 with different Te 4+ doping concentrations presents a consistent emission peak at 575 nm. When the excitation and emission spectra of Rb 2 ZrCl 6 : x Te 4+ are characterized, it is found that the excitation peak of 388 nm is detected at the emission wavelength of 575 nm, and this excitation peak is from the triplet emission of Te 4+ [ 32 ].…”

“…Shi introduced the tunable emission characteristics of Rb 2 ZrCl 6 : x Sb 3+ phosphors that depend on the different excitation wavelengths [ 31 ]. In 2023, Liu synthesized Te 4+ doped Rb 2 ZrCl 6 microcrystals, and conducted a preliminary study on their optical properties to manufacture white light emitting diodes [ 32 ]. These studies on Rb 2 ZrCl 6 proved that it has excellent luminescence properties.…”

“…Materials with photochromic properties were excellent candidates for anti-counterfeiting applications where light of different colors was emitted under different excitation wavelengths. It has been reported that Rb 2 ZrCl 6 :Te 4+ exhibited characteristics of emitting blue and yellow light at 255 nm and 388 nm, respectively, making it a promising material for anti-counterfeiting applications [ 32 ]. In addition, Rb 2 ZrCl 6 was a scintillator material with potential.…”