A full visible LED enabled by a broadband yellow emission nepheline phosphor derived from a europium doped SOD zeolite

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Blue phosphors of high efficiency and superior thermal stability constitute the critical component for achieving high-quality white light-emitting diodes (WLEDs). Herein, we report a highly efficient blue-emitting phosphor with superior thermal stability by heating Eu 3+ -doped Faujasite Y zeolite under a reducing atmosphere. The intensity and peak value of the phosphor are highly dependent on calcination temperature, and the intensity of PLE and PL spectra reaches a maximum at 1100 °C. Under the excitation of 360 nm, the phosphor shows a high quantum efficiency (90%) and thermal stability (the emission intensity at 423 K is about 125% of that at room temperature). WLEDs fabricated using this blue phosphor, a yellow Eu 2+ -SOD phosphor, and a commercially available red Sr 2 Si 5 N 8 :Eu 2+ phosphor exhibit an excellent optical performance with a correlated color temperature of 4359 K and a color rendering index of 97. This work provides a new strategy for the synthesis of phosphors with high thermal stability and luminous efficiency.

Section: Resultsmentioning

confidence: 99%

High-Quantum-Efficiency Blue Phosphors with Superior Thermal Stability Derived from Eu³⁺-Doped Faujasite Y Zeolite

Zhou,

Feng,

Yin

et al. 2023

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“…Some strategies are adopted to enhance its absorption in the near-UV region. Rare-earth ions Eu 2+ /Ce 3+ can effectively absorb UV light, transfer its energy to Mn 2+ , and finally improve the luminescence of Mn 2+ in the appropriate host compound. , In recent reports, the effectiveness of energy transfer strategy between Ce 3+ /Eu 2+ and Mn 2+ has been demonstrated, such as Ba 3 Y(PO 4 ) 3 :Mn 2+ /Eu 2+ /Ce 3+ , Sr 8 CaSc(PO 4 ) 7 :Mn 2+ /Eu 2+ /Ce 3+ , and Ba 9 Sc 2 Si 6 O 24 :Mn 2+ /Eu 2+ /Ce 3+ . The energy transfer between Ce 3+ /Eu 2+ and Mn 2+ makes Mn 2+ more compatible with the near-UV LED chip and expands the application of Mn 2+ in the field of wLEDs.…”

Section: Introductionmentioning

confidence: 99%

Thermally Stable Red-Emitting Ca₁₈K₃Sc(PO₄)₁₄:Mn²⁺ Phosphor and Enhanced Luminescence by Energy Transfer Between Ce³⁺-Eu²⁺-Mn²⁺

Deng,

Shang,

Sun

et al. 2024

It is significant and valuable to investigate novel and high-performance red-emitting phosphors for high-quality wLED applications. Based on this consideration, we developed a novel Mn 2+ -doped red Ca 18 K 3 Sc(PO 4 ) 14 :Mn 2+ (CKSP:Mn 2+ ) phosphor. The emission peak of CKSP:Mn 2+ is located at 640 nm, presenting a broadband red emission with a fwhm of 79 nm under 405 nm excitation. The CKSP:1.0Mn 2+ phosphor shows superior thermal stability. At 150 °C, the integrated PL intensity and peak intensity of the CKSP:1.0Mn 2+ phosphor maintain 93.2 and 85.7% of those at 25 °C, respectively. Through the strategy of energy transfer among Ce 3+ -Eu 2+ -Mn 2+ , the PL intensity of Mn 2+ has increased by nearly 118 times, and the quantum yield has improved from 6 up to 72%. The structure-related photoluminescence and energy transfer mechanisms are discussed in detail. The as-fabricated wLED pumped by a 370 nm LED chip combining commercial the green (Sr,Ba) 2 SiO 4 :Eu 2+ phosphor, blue BaMgAl 10 O 17 :Eu 2+ phosphor, and the as-synthesized CKSP:1.0Mn 2+ , 0.02Eu 2+ , 0.40Ce 3+ phosphor shows excellent color quality (CCT = 5555 K, Ra = 87), which indicates that the CKSP:1.0Mn 2+ , 0.02Eu 2+ , 0.40Ce 3+ phosphor has extraordinary broad prospects in future wLED applications.

“…Phosphor-converted white-LEDs is increasingly anticipated as an emerging lighting source. − High-quality phosphor is the key for healthy and green white-LEDs, ensuring high color rendering index (CRI), low correlated color temperature (CCT), and outstanding lighting thermostability. − Especially, the working temperature of the device can reach up to 473 K during a continuous operation, inducing susceptible fluorescence quenching of phosphor. , This has an unfavorable impact on the lighting color stability of white-LEDs. Hereby, constructing a highly thermostable LED phosphor is critical.…”

Section: Introductionmentioning

confidence: 99%

Study on a Highly Thermostable Dy³⁺-Activated Borophosphate Phosphor

Liu,

Zheng,

Qin

et al. 2024

Constructing a phosphor with multifunctional applications is an imperative challenge. Especially, highly thermostable luminescence of phosphor is indispensable for stable whitelight-emitting diodes (LEDs). Nevertheless, good thermal quenching resistance behavior is unfavorable for a fluorescence intensity ratio (FIR)-based optical temperature sensor. Herein, a highly thermostable Ba 3 (ZnB 5 O 10 )PO 4 (BZBP)-based phosphor is successfully achieved via replacing Ba 2+ with Dy 3+ , demonstrating simultaneously promising lighting and thermometry utilizations. Under the excitation of 350 nm, the title phosphor only loses 12% of the initial intensity when the temperature is up to 473 K, ensuring sufficient luminescence thermostability for white-LED lighting. The white-LED device fabricated using the title phosphor emits highquality white light with a high color rendering index (R a = 93) and low correlated color temperature (CCT = 3996 K). Meanwhile, the yellow and blue emission intensities demonstrate a downtrend difference with rising temperature. Temperature sensing properties are assessed through FIR technology. The maximal relative sensitivity reaches as high as 0.0379 K −1 at 298 K. These results reveal that the title phosphor has a great potential for indoor lighting and thermometry applications.