2023
DOI: 10.1021/acs.inorgchem.2c04347
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Ultra-Broadband Near-Infrared Phosphors Realized by the Heterovalent Substitution Strategy

Abstract: Near-infrared (NIR) phosphor-converted light-emitting diodes with broadband emission have received considerable interest. However, there remains a challenge in the construction of ultra-broadband NIR phosphors, hindering their further application. In this work, a heterovalent substitution strategy is proposed to construct a novel ultra-broadband NIR-emitting LaTiTaO 6 :Cr 3+ phosphor with a full width at half maximum of ∼300 nm. Crystal structure, time-resolved emission spectroscopy, and electron paramagnetic … Show more

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Cited by 28 publications
(10 citation statements)
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“…Subsequently, as the amount of Cr 3+ ions doped is further increased, the emission intensity declines owing to the concentration quenching effect resulting from the energy transfer from the Cr 3+ ions to quenching centers such as lattices or surface defects. The mechanism of the concentration quenching effect can be comprehended by calculating the critical energy transfer distance ( R c ) through the utilization of the following equation: R c = 2 ( 3 V 4 π x c N ) 1 / 3 The equation incorporates several parameters, including the number of central cations in a unit cell ( N ), the critical concentration ( x c ), and the cell volume ( V ). In the case of CLZSA:0.08Cr 3+ , N is equal to 8, V is equal to 1862.77 Å 3 , and x c is equal to 0.08.…”
Section: Resultsmentioning
confidence: 99%
“…Subsequently, as the amount of Cr 3+ ions doped is further increased, the emission intensity declines owing to the concentration quenching effect resulting from the energy transfer from the Cr 3+ ions to quenching centers such as lattices or surface defects. The mechanism of the concentration quenching effect can be comprehended by calculating the critical energy transfer distance ( R c ) through the utilization of the following equation: R c = 2 ( 3 V 4 π x c N ) 1 / 3 The equation incorporates several parameters, including the number of central cations in a unit cell ( N ), the critical concentration ( x c ), and the cell volume ( V ). In the case of CLZSA:0.08Cr 3+ , N is equal to 8, V is equal to 1862.77 Å 3 , and x c is equal to 0.08.…”
Section: Resultsmentioning
confidence: 99%
“…Thus, the nephelauxetic effect is getting enhanced, which eventually leads to the redshift phenomenon of both excitation and emission spectra. It is known that spectral properties including the broadening peak width and red-shift of emission spectra are closely related to electron–phonon coupling. , A stronger electron–phonon coupling leads to peak-width broadening and emission red-shift, but the probability of thermal quenching and nonradiative decay would also increase. As a result, it is a trade-off among the red-shift of the emission wavelength, broadened peak width, and worsened emission thermal stability.…”
Section: Resultsmentioning
confidence: 99%
“…Generally, the thermal stability of phosphors is a key factor in determining their application potential of pc-LEDs. Hence, the emission spectra of solid-solution phosphors ( x = 0.0–0.5) measured in the variable temperature range of 298–498 K are depicted in Figure a–f. The changes of fwhm and the position of the predominant emission band at variable temperature are demonstrated in Figure a–f insets.…”
Section: Resultsmentioning
confidence: 99%