Structural and spectroscopic investigation of an efficient and broadband NIR phosphor InBO3: Cr3+ and its application in NIR pc-LEDs

Sun, Zishan; Ning, Qixia; Zhou, Weiying; Luo, Juan; Chen, Peican; Zhou, Liya; Pang, Qi; Zhang, Xinguo

doi:10.1016/j.ceramint.2021.01.218

Cited by 86 publications

(35 citation statements)

References 27 publications

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“…Generally, broadband NIR emission phosphors have been realized by doping suitable structures with metal ions, such as Eu 2+ , Mn 2+ , Ni 2+ , or Cr 3+ . [ 14–20 ] In particular, Cr 3+ ‐doped phosphors have received increasing attention owing to their intrinsic broadband NIR emission and blue‐light excitation features. [ 21–23 ] Moreover, this type of emission can be realized by simply doping Cr 3+ ions into a weak octahedral crystal field environment.…”

Section: Introductionmentioning

confidence: 99%

A General Ammonium Salt Assisted Synthesis Strategy for Cr³⁺‐Doped Hexafluorides with Highly Efficient Near Infrared Emissions

Song

Zhou

et al. 2021

Adv Funct Materials

129

111

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The discovery of highly efficient broadband near infrared (NIR) emission material is urgent and crucial for constructing NIR lighting sources and emerging applications. Herein, a series of NIR emission hexafluorides A2BMF6:Cr3+ (A = Na, K, Rb, Cs; B = Li, Na, K, Cs; M = Al, Ga, Sc, In) peaking at ≈733–801 nm with a full width at half maximum (FWHM) of ≈98–115 nm are synthesized by a general ammonium salt assisted synthesis strategy. Benefiting from the pre‐ammoniation of the trivalent metal sources, the Cr3+ can be more efficiently doped into the A2BMF6 and simultaneously prevent the generation of the competitive phase. Particularly, Na3ScF6:Cr3+ (λem = 774 nm, FWHM ≈ 108 nm) with optimal Cr3+‐doping concentration of 35.96% shows a high internal quantum efficiency of 91.5% and an external quantum efficiency of ≈40.82%. A lighting emitting diode (LED) device with a NIR output power of ≈291.05 mW at 100 mA driven current and high photoelectric conversion efficiency of 20.94% is fabricated. The general synthesis strategy opens up new avenues for the exploration of Cr3+‐doped high efficiency phosphors, and the as‐obtained record NIR output power demonstrates for NIR LED lighting sources applications.

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Section: Introductionmentioning

confidence: 99%

A General Ammonium Salt Assisted Synthesis Strategy for Cr³⁺‐Doped Hexafluorides with Highly Efficient Near Infrared Emissions

Song

Zhou

et al. 2021

Adv Funct Materials

129

111

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“…Thus, numerous studies have been conducted to develop efficient FR phosphors and pc‐LEDs in recent three years. [ 6–26 ]…”

Section: Introductionmentioning

confidence: 99%

“…Up to now, the highest η pcLED of FR/NIR pc‐LEDs ever reported is 21.28% in FR Ca 2 LuHf 2 Al 3 O 12 :Cr 3+ pc‐LED [ 14 ] and 23% in NIR LiInSi 2 O 6 :Cr 3+ pc‐LED. [ 24 ]…”

Section: Introductionmentioning

confidence: 99%

Cr³⁺ Activated Garnet Phosphor with Efficient Blue to Far‐Red Conversion for pc‐LED

Han

Zhang

et al. 2021

Advanced Optical Materials

118

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Far‐red (FR) phosphor‐converted light‐emitting diodes (pc‐LEDs) driven by blue LED chips are novel light sources for applications in phototherapy, photosynthesis, natural light simulation, and so on but still bear low electricity‐to‐FR light conversion efficiency (≤ 23%) due to deficiency of phosphors that have both high blue light absorptance and high FR internal quantum efficiency (IQE) for the realization of efficient blue to FR conversion. FR Ca3Sc2Si3O12 (CSSG):Cr3+ garnet phosphor has ultra‐high IQE (> 90%) but low blue light absorption. Here, a twofold increase of blue light absorption cross‐section is reported with still high FR IQE via Lu3+−Mg2+ substitution for Ca2+−Sc3+ in CSSG:Cr3+ to form Ca3–xLuxMgxSc2–xSi3O12:Cr3+ garnet solid solution, which is attributed to enhanced mixing of odd‐parity configuration into 3d configuration of Cr3+ induced by the cations substitution. Optical properties, crystal field strengths, and thermal stabilities of the solid solution phosphors are studied as a function of x. After complete replacement of Sc3+, the as‐fabricated FR pc‐LED emits at 750 nm with 65.7% blue‐to‐FR quantum conversion efficiency and consequently offers an electricity‐to‐FR light conversion efficiency over 30%. Moreover, the solid solution phosphors show high quenching temperatures in the range of 580–610 K. The results can advance the development of efficient FR phosphors and pc‐LEDs for various applications.

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“…7(c) and (d)). Driven by 120 mA current, the NIR output power and photoelectric efficiency are 33.42 mW and 9.77% for the pc-LED prepared with NIP:0.04Cr 3+ , and 39.11 mW and 10.93% for that prepared with NIP:0.04Cr 3+ + 10%Li 2 CO 3 , respectively, which is better than the LED characteristics of NaScSi 2 O 6 :Cr 3+ (26 mW@100 mA, 8.6%), 13 LiScP 2 O 7 :Cr 3+ (19 mW@100 mA, 7%), 23 InBO 3 :Cr 3+ (37.50 mW@120 mA, 10.42%), 44 ScBO 3 :Cr 3+ (26 mW@120 mA, 7%), 45 LiGaP 2 O 7 :Cr 3+ (28.10 mW@120 mA, 7.8%), 47 and LiInP 2 O 7 :Cr 3+ (6.42 mW@100 mA, 2.20%) 48 (listed in Table 2). These results demonstrate the huge potential of the NIP:Cr 3+ phosphor for application in NIR pc-LEDs.…”

Section: Resultsmentioning

confidence: 85%

Efficient Cr³⁺-activated NaInP₂O₇ phosphor for broadband near-infrared LED applications

Wang

Tan

et al. 2022

Inorg. Chem. Front.

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Structural and spectroscopic investigation of an efficient and broadband NIR phosphor InBO3: Cr3+ and its application in NIR pc-LEDs

Cited by 86 publications

References 27 publications

A General Ammonium Salt Assisted Synthesis Strategy for Cr³⁺‐Doped Hexafluorides with Highly Efficient Near Infrared Emissions

A General Ammonium Salt Assisted Synthesis Strategy for Cr³⁺‐Doped Hexafluorides with Highly Efficient Near Infrared Emissions

Cr³⁺ Activated Garnet Phosphor with Efficient Blue to Far‐Red Conversion for pc‐LED

Efficient Cr³⁺-activated NaInP₂O₇ phosphor for broadband near-infrared LED applications

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Structural and spectroscopic investigation of an efficient and broadband NIR phosphor InBO3: Cr3+ and its application in NIR pc-LEDs

Cited by 86 publications

References 27 publications

A General Ammonium Salt Assisted Synthesis Strategy for Cr3+‐Doped Hexafluorides with Highly Efficient Near Infrared Emissions

A General Ammonium Salt Assisted Synthesis Strategy for Cr3+‐Doped Hexafluorides with Highly Efficient Near Infrared Emissions

Cr3+ Activated Garnet Phosphor with Efficient Blue to Far‐Red Conversion for pc‐LED

Efficient Cr3+-activated NaInP2O7 phosphor for broadband near-infrared LED applications

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Product

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A General Ammonium Salt Assisted Synthesis Strategy for Cr³⁺‐Doped Hexafluorides with Highly Efficient Near Infrared Emissions

A General Ammonium Salt Assisted Synthesis Strategy for Cr³⁺‐Doped Hexafluorides with Highly Efficient Near Infrared Emissions

Cr³⁺ Activated Garnet Phosphor with Efficient Blue to Far‐Red Conversion for pc‐LED

Efficient Cr³⁺-activated NaInP₂O₇ phosphor for broadband near-infrared LED applications