Defect and energy transfer induced abnormal thermally stable and highly efficient narrow-band green emission

Shi, Rou; Cao, Shu-Jie; Han, Yibo; Zhang, Jilin; Zhang, Xinguo; Liao, Shuzhen; Lian, Shixun

doi:10.1016/j.apmt.2022.101625

Cited by 7 publications

(2 citation statements)

References 33 publications

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“…Notably, the highest energy transfer efficiency progressively nears 100%, such a phenomenon attributable to the highly efficient Eu 2+ -Mn 2+ energy transfer established within the b-Al 2 O 3 structural framework. [24][25][26][27] The schematic diagram of the energy transfer process from Eu 2+ to Mn 2+ is shown in Fig. 4f, where Eu 2+ ions are excited by UV light and transitions to the 5d energy level, producing blue emission, or transfer the energy from 5d level of Eu 2+ to the 4 T 2 ( 4 G) of Mn 2+ , and then finally relax from 4 T 2 ( 4 G) to 4 T 1 ( 4 G), resulting in efficient green emission.…”

Section: Resultsmentioning

confidence: 99%

Enhanced narrow green emission via efficient energy transfer from Eu²⁺ to Mn²⁺ in KAl₄Ga₇O₁₇ for backlit LCD displays

Zhang,

Lu,

Zhang

et al. 2024

J. Mater. Chem. C

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Section: Resultsmentioning

confidence: 99%

Enhanced narrow green emission via efficient energy transfer from Eu²⁺ to Mn²⁺ in KAl₄Ga₇O₁₇ for backlit LCD displays

Zhang,

Lu,

Zhang

et al. 2024

J. Mater. Chem. C

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“…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%

From Ancient Blue Pigment to Unconventional NIR Phosphor: A Thermal-Stable Near-Infrared I/II Broadband Emission from Ca_1–xSr_xCuSi₄O₁₀ Solid Solution

Huang,

Zhang,

Fan

et al. 2023

Inorg. Chem.

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Phosphors used in NIR spectroscopy require broadband emission, high external quantum yield, good ability, as well as a tunable spectral range to meet the detection criteria. Two-dimensional copper silicates MCuSi 4 O 10 (M = Ca, Sr, Ba) play an important part in ancient art and technology as synthetic blue pigments. In the recent years, these compounds were reported to show a broad near-infrared emission when excited in the visible region. Inspired by the tunable structure of MCuSi 4 O 10 , a series of broadband phosphors Ca 1−x Sr x CuSi 4 O 10 were designed for realizing continuously tunable NIR emission by a modulated Cu 2+ crystal field environment. The emission maximum exhibits a red shift from 915 to 950 nm and the integral intensity enhances as the Sr 2+ content varies in the range of 0−0.50, which is led by the lattice expansion and the following weakened crystal field splitting on tetrahedral-coordinated Cu 2+ . Compared to CaCuSi 4 O 10 , the optimized sample Ca 0.5 Sr 0.5 CuSi 4 O 10 shows enhanced NIR emission by about 2.0-fold. It exhibits quite a high external quantum efficiency covering the NIR-I and -II regions (λ max = 950 nm, fwhm = 135 nm, EQE = 26.3%) with a strong absorption efficiency (74.7%) and a long excited-state lifetime (134 μs). These solid-solution phosphors (x = 0.0−0.5) show excellent thermal stability and maintain over 50% of the RT intensity at 200 °C. The optimized phosphor was encapsulated with redlight chips to fabricate NIR pc-LED and put into night-vision application. These good properties make these Cu 2+ -activated NIR phosphors appealing for multiple applications such as nondestructive testing, night version, lasers, and luminescent solar concentrators.

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Killing Three Birds with One Stone: Energy Transfer Inducing Efficient, Zero Thermal Quenching, and Emission‐Color Tunable Phosphors

Tang,

Zhang,

Liao

et al. 2024

Advanced Optical Materials

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Red emission phosphors with high efficiency and excellent thermal stability are essential for phosphor‐converted light‐emitting diodes (pc‐LEDs). Na2MgPO4F: Mn2+ shows a very weak red emission peak at 615 nm due to 3d–3d forbidden transition. And it exhibits a normal thermal quenching behavior. Blue‐emitting Eu2+ with anti‐thermal quenching (ATQ) is introduced to tune the emission color, emission efficiency, and thermal stability of Mn2+ in Na2MgPO4F. The emission color of Na2MgPO4F: Eu2+, Mn2+ phosphors can be tuned by increasing the Mn2+ content. The internal and external quantum efficiencies of Na2MgPO4F:0.03Eu2+, 0.05Mn2+ are 89.3% and 41.1%, respectively, which are much higher than those of the Mn2+‐doped ones. Furthermore, the ATQ effect of Eu2+ is also transferred to Mn2+ via energy transfer, which results in Na2MgPO4F: Eu2+, Mn2+ phosphors with zero thermal quenching (ZTQ). The cooperation of energy transfer, enhanced absorption, and increased defects amount promotes the achievement of ZTQ in the co‐doped samples. Two white pc‐LEDs with a color rendering index of more than 90 are manufactured by using the as‐synthesized Na2MgPO4F: Eu2+, Mn2+ phosphors combined with near‐UV chips. This study not only provides high‐performance Eu2+, Mn2+ co‐doped phosphors suitable for high‐quality solid‐state lighting, but also exhibits a killing‐three‐birds‐with‐one‐stone strategy to obtain efficient, thermally stable, and color‐tunable phosphors.

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Defect and energy transfer induced abnormal thermally stable and highly efficient narrow-band green emission

Cited by 7 publications

References 33 publications

Enhanced narrow green emission via efficient energy transfer from Eu²⁺ to Mn²⁺ in KAl₄Ga₇O₁₇ for backlit LCD displays

Enhanced narrow green emission via efficient energy transfer from Eu²⁺ to Mn²⁺ in KAl₄Ga₇O₁₇ for backlit LCD displays

From Ancient Blue Pigment to Unconventional NIR Phosphor: A Thermal-Stable Near-Infrared I/II Broadband Emission from Ca_1–xSr_xCuSi₄O₁₀ Solid Solution

Killing Three Birds with One Stone: Energy Transfer Inducing Efficient, Zero Thermal Quenching, and Emission‐Color Tunable Phosphors

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Defect and energy transfer induced abnormal thermally stable and highly efficient narrow-band green emission

Cited by 7 publications

References 33 publications

Enhanced narrow green emission via efficient energy transfer from Eu2+ to Mn2+ in KAl4Ga7O17 for backlit LCD displays

Enhanced narrow green emission via efficient energy transfer from Eu2+ to Mn2+ in KAl4Ga7O17 for backlit LCD displays

From Ancient Blue Pigment to Unconventional NIR Phosphor: A Thermal-Stable Near-Infrared I/II Broadband Emission from Ca1–xSrxCuSi4O10 Solid Solution

Killing Three Birds with One Stone: Energy Transfer Inducing Efficient, Zero Thermal Quenching, and Emission‐Color Tunable Phosphors

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Enhanced narrow green emission via efficient energy transfer from Eu²⁺ to Mn²⁺ in KAl₄Ga₇O₁₇ for backlit LCD displays

Enhanced narrow green emission via efficient energy transfer from Eu²⁺ to Mn²⁺ in KAl₄Ga₇O₁₇ for backlit LCD displays

From Ancient Blue Pigment to Unconventional NIR Phosphor: A Thermal-Stable Near-Infrared I/II Broadband Emission from Ca_1–xSr_xCuSi₄O₁₀ Solid Solution