Recent advances in solid-state LED phosphors with thermally stable luminescence

Qiao, Jianwei; Zhao, Jing; Liu, Quanlin; Xia, Zhiguo

doi:10.1016/j.jre.2018.11.001

Cited by 220 publications

(97 citation statements)

References 60 publications

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“…Recently, Qiao et al systematically summarized the strategies to decrease the thermal quenching performance of phosphors, including defect levels, cation disorder, structural rigidity, phosphors coating and phosphors in glass. These designing methods can help to solve the thermal quenching behavior in many phosphor materials . The main reason is that thermal quenching property is strongly associated with the crystal structure such as structure rigidity and symmetry.…”

Section: Introductionmentioning

confidence: 99%

Strategies for Designing Antithermal‐Quenching Red Phosphors

et al. 2020

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efficiency,low-energy consumption, long lifetime, and environmental compatibility, and so on. [1][2][3] The common w-LEDs devices are fabricated via two combination strategies: 1) blue LED chip and yellow phosphor; 2) nearultraviolet (n-UV) LED chip and tricolor phosphors. [4,5] No matter for which fabrication methods, the development of red phosphor is crucial to improve the lighting quality and tune corrected color temperature of w-LEDs. [6,7] To date, many researchers have focused on exploring highly efficient red phosphors. Although Eu 2+ -doped nitride phosphors such as CaAlSiN 3 :Eu 2+ and Sr 2 Si 5 N 8 :Eu 2+[8-10] show high quantum yield (QY > 90%) and high thermal quenching temperature (>600 K), the harsh preparation conditions (high pressure ≥ 0.9-2.5 MPa; high temperature ≥1700-200 °C) and deepred emission position (beyond 650 nm) limit the large-scale application in indoor lighting. Eu 3+ -doped inorganic compounds are typical red-emitting phosphors due to the (4f 6 ) 5 D 0 → (4f 6 ) 7 F J spin-and parity-forbidden transition, [11,12] but it is hardly utilized in w-LEDs applications owing to the linearly narrow excitation and emission. [13,14] Mn 4+ has been considered as the promising red-emitting activator Nowadays, red phosphor plays a key role in improving the lighting quality and color rendering index of phosphor-converted white light emitting diodes (w-LEDs). However, the development of thermally stable and highly efficient red phosphor is still a pivotal challenge. Herein, a new strategy to design antithermal-quenching red emission in Eu 3+ , Mn 4+ -codoped phosphors is proposed.

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Section: Introductionmentioning

confidence: 99%

Strategies for Designing Antithermal‐Quenching Red Phosphors

et al. 2020

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“…Qiao et al . focused on the thermal quenching behaviour of the various LED phosphors during the high‐power LED operation and provided an insight to discover phosphors with high structural rigidity, designing controlled traps in the host lattice and a subsequent surface coating strategy to enhance thermal stability …”

Section: Introductionmentioning

confidence: 99%

Tunable lanthanide/transition metal ion‐doped novel phosphors for possible application in w‐LEDs: a review

Tiwari

Dhoble

2019

Luminescence

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Lanthanide-based phosphors have been extensively investigated for their possible applications in solid-state lighting technologies especially for white-light-emitting diodes. In this review article emphasis has been laid on discussing the recent developments of phosphors for warm white-light production based on various optical characteristics such as quantum efficiency, thermal stability, short emission decay time, long-term stability, facile synthesis, and low cost of production. We have tried to cover the essential and latest discoveries of the lanthanide/rare earth-doped phosphors after 2010. New generations of narrow-band phosphors have also been included. The optical and material properties of several novel phosphors and their luminescence characteristics have been thoroughly discussed.

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“…This is especially a drawback for pc-wLEDs containing multiple phosphors, as it will not only decrease the light output, but will also change the overall colour emitted by the LED. Various strategies have therefore been developed to obtain thermally stable LED phosphors, 15 like for the blue-emitting Na 3 Sc 2 (PO 4 ) 3 :Eu 2+ phosphor that does not have any decrease of emission intensity up to 200 1C. 16 As for the (oxy)nitride phosphors, the commercially available Sr 2 Si 5 N 8 :Eu 2+ , b-sialon:Eu 2+ , CaAlSiN 3 :Eu 2+ and SrSi 2 O 2 N 2 :Eu 2+ phosphors show relatively good thermal stability, while for many other phosphors the emission intensity rapidly decreases with temperature.…”

Section: Introductionmentioning

confidence: 99%