Disorder–Order Conversion‐Induced Enhancement of Thermal Stability of Pyroxene Near‐Infrared Phosphors for Light‐Emitting Diodes

Wen, Dawei; Liu, Hong‐Min; Guo, Yue; Zeng, Qingguang; Wu, Mingmei; Liu, Ru‐Shi

doi:10.1002/ange.202204411

Cited by 24 publications

(9 citation statements)

References 47 publications

(51 reference statements)

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“…In addition, the luminescence properties of (Mg 1-y Li y )(Mg 1-y Sc y )Ge 2 O 6 :Cr 3+ , NaSc(Si 2-x Ge x )O 6 :Cr 3+ , LiIn(Si 2-x Ge x )O 6 :Cr 3+ , LiSc(Si 1-x Ge x ) 2 O 6 :Cr 3+ , a n d CaSc 1-x Mg x Al 1-x Si 1+x O 6 :Cr 3+ phosphors have also been explored in detail. [123][124][125][126][127]…”

Section: Pyroxene-type Structurementioning

confidence: 99%

Advances in Chromium‐Activated Phosphors for Near‐Infrared Light Sources

Zhao

Song

Liu

2022

Laser & Photonics Reviews

197

145

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Cr3+/Cr4+‐activated near‐infrared (NIR) luminescent materials have attracted extensive attention owing to their tunable emission wavelength and widespread applications in plant growth, food analysis, biomedical imaging, night vision, and so on. Plenty of excellent NIR materials are developed by introducing Cr3+/Cr4+ ion to various inorganic hosts. Herein, the effect of crystal field on Cr3+/Cr4+ luminescence by combining the Tanabe–Sugano energy level diagram and configuration coordinate model is discussed. Research progress of Cr3+/Cr4+‐doped NIR luminescent materials, including the phosphors designed from structural models with octahedral, tetrahedral, and other coordination types, is then outlined. The luminescence properties of more than 200 kinds of Cr3+/Cr4+‐doped materials are summarized. In particular, several strategies for tuning emission wavelength, broadening emission band, enhancing NIR luminescence efficiency, and improving thermal stability, are listed. Finally, the current challenges and future prospects in the research of Cr3+/Cr4+‐doped NIR luminescent materials are presented. This review will contribute to a deeper understanding of not only Cr3+/Cr4+ luminescence mechanism but also the current research progress of chromium‐doped luminescent materials, so as to develop more Cr3+/Cr4+‐activated NIR luminescent materials with better performance and explore more applications.

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Section: Pyroxene-type Structurementioning

confidence: 99%

Advances in Chromium‐Activated Phosphors for Near‐Infrared Light Sources

Zhao

Song

Liu

2022

Laser & Photonics Reviews

197

145

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“…14 However, lattice distortion and structural disorder can enhance the electron−phonon coupling and the degree of crystal field energy splitting, thereby also leading to a broader emission spectrum. 15 Previous studies report Ga 2 O 3 to have highly efficient (IQE > 90%) NIR emission with a maximum emission peak at 715 nm using a Cr 3+ activator. 16 Broadened emission is found for the Ga 2−x Sc x O 3 :Cr 3+ and Ga 2−x In x O 3 :Cr 3+ material series, 17,18 while lattice shrinkage in Ga 2−x Al x O 3 :Cr 3+ narrowed the emission spectrum.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Attempts to broaden the FWHM of type I phosphors have focused mostly on tuning the crystal field strength of the activator by lattice expansion, thus broadening the emission spectrum with a red shift . However, lattice distortion and structural disorder can enhance the electron–phonon coupling and the degree of crystal field energy splitting, thereby also leading to a broader emission spectrum …”

Section: Introductionmentioning

confidence: 99%

Broadening Phosphor-Converted Light-Emitting Diode Emission: Controlling Disorder

et al. 2022

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Near-infrared (NIR) phosphor-converted lightemitting diodes (pc-LEDs) are a highly efficient perspective NIR light source, with application hindered by a narrow emission band. In this work, we broaden the emission of a new series of NIR phosphors by controlling crystal structure disorder through cation cosubstitution. By substituting Ga 3+ with (Al 0.68 In 0.32 ) 3+ , we create a Ga 2−x (Al 0.68 In 0.32 ) x O 3 :Cr 3+ phosphor series in which the average crystal size is maintained, while cation disorder varies. The increased deviation of the cation radii in the substitution leads to increased electron−phonon coupling, with a resulting emission spectrum covering the 650−1000 nm range with a 30% increase in the emission full width at half-maximum (FWHM) and a relatively high internal quantum efficiency of ∼80%. A transition from the β phase to the α phase, which differs in structure from the undoped parent, is created by the application of high pressure and possesses ultra-broad-band emission and an FWHM of ∼190 nm. This work shows that the emission bandwidth can be controlled through disorder and its influence on the Stokes shift, as captured by the effective Huang−Rhys factor.

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“…Cr 3+ -doped pyroxene AB(Si,Ge) 2 O 6 (A = Li, Na, or Ca, and B = Sc, In, or Mg) usually shows a broadband emission in the long wavelength region (peak at 820–950 nm) with IQEs of 21–81.2% and I 423 K values of 20–90%. − It has been noticed that the thermal stability of silicates is better than that of germanates. For instance, at 423 K, LiScSi 2 O 6 :Cr 3+ (LSS:Cr 3+ ) maintains 75% of the luminescence intensity at room temperature, much better than that of LiScGe 2 O 6 :Cr 3+ (38%). , Therefore, further broadening the emission band and improving the thermal stability based on silicates are worthy of study.…”

Section: Introductionmentioning

confidence: 99%

Improved Near-Infrared Luminescence Properties of LiScSi₂O₆:Cr³⁺,Yb³⁺ Phosphors via Efficient Energy Transfer

Liu

Chen

et al. 2023

ACS Appl. Opt. Mater.

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Developing high-performance broadband near-infrared (NIR) phosphors for NIR phosphor-converted light-emitting diodes is still a challenge. Co-doping is an effective strategy for enhancing the performance of NIR phosphors. Herein, we explore a NIR phosphor by co-doping Yb 3+ into LiScSi 2 O 6 :Cr 3+ (LSS:Cr 3+ ). Under 468 nm excitation, LSS:Cr 3+ ,Yb 3+ exhibits a broad NIR emission from 700 to 1100 nm. Due to the efficient energy transfer from Cr 3+ to Yb 3+ , the maximum bandwidth of LSS:Cr 3+ ,Yb 3+ reaches 219 nm, broader than that of LSS:Cr 3+ (170 nm). The addition of Yb 3+ further suppresses the thermal quenching compared with that of the Cr 3+ singly doped specimen. At 150 °C, LSS:Cr 3+ ,Yb 3+ retains 62% of the emission intensity at room temperature, while that of singly doped LSS:Cr 3+ is only 40%. These results indicate that the construction of Cr 3+ → Yb 3+ energy transfer not only can broaden the emission spectrum but also can improve the thermal stability.

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Disorder–Order Conversion‐Induced Enhancement of Thermal Stability of Pyroxene Near‐Infrared Phosphors for Light‐Emitting Diodes

Cited by 24 publications

References 47 publications

Advances in Chromium‐Activated Phosphors for Near‐Infrared Light Sources

Advances in Chromium‐Activated Phosphors for Near‐Infrared Light Sources

Broadening Phosphor-Converted Light-Emitting Diode Emission: Controlling Disorder

Improved Near-Infrared Luminescence Properties of LiScSi₂O₆:Cr³⁺,Yb³⁺ Phosphors via Efficient Energy Transfer

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Disorder–Order Conversion‐Induced Enhancement of Thermal Stability of Pyroxene Near‐Infrared Phosphors for Light‐Emitting Diodes

Cited by 24 publications

References 47 publications

Advances in Chromium‐Activated Phosphors for Near‐Infrared Light Sources

Advances in Chromium‐Activated Phosphors for Near‐Infrared Light Sources

Broadening Phosphor-Converted Light-Emitting Diode Emission: Controlling Disorder

Improved Near-Infrared Luminescence Properties of LiScSi2O6:Cr3+,Yb3+ Phosphors via Efficient Energy Transfer

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Improved Near-Infrared Luminescence Properties of LiScSi₂O₆:Cr³⁺,Yb³⁺ Phosphors via Efficient Energy Transfer