Improving Thermal Stability of Eu3+ Luminescence via High-Concentration Terbium Doping in NaGd2Ga3Ge2O12 Garnet DOI
Feiyan Xie,

Junqiang Gu,

Shengqian Wang

et al.

Inorganic Chemistry, Journal Year: 2025, Volume and Issue: unknown

Published: April 10, 2025

Phosphors for white light-emitting diodes (WLEDs) would suffer from inadequate luminescent thermal stability, especially at high temperatures, affecting both the reliability and lifespan of devices. Thus, development phosphors with excellent stability is a crucial task. By use high-temperature solid-state reaction method, series Tb3+ Eu3+ codoped NaGd2Ga3Ge2O12 (abbreviated as NGGGO) has been successfully synthesized. With an appropriate doping concentration Eu3+, NGGGO:Tb3+,Eu3+ can provide color tunable emissions; simultaneously, energy transfer (ET) efficiency to reach nearly 100%. Notably, high-concentration in NGGGO could induce oxygen vacancies, giving significant enhancement on luminescence. For NGGGO:60% Tb3+,1.6% phosphor, emission intensity 450 K remained even higher than that observed under room-temperature conditions. as-synthesized phosphor red converter, near-ultraviolet pumped WLED device be fabricated. Under driving current 20 mA, exhibits rendering index (CRI) ∼ 89, low correlated temperature (CCT) 4603 K, bright light CIE chromaticity coordinates (0.3569, 0.3587), which demonstrates potential application.

Language: Английский

Synergetic Contributions of High Quenching Concentration and Tuned Square Antiprism Geometry Boosting Far‐Red Emission of Eu3+ with Near‐Unit Efficiency DOI Creative Commons
Hong Li, Asif Ali Haider, Zhi Xie

et al.

Advanced Science, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 10, 2025

Abstract Far‐red phosphors have emerged as a desirable research hotspot owing to their critical role in promoting plant growth. Especially, Eu 3+ ions typically present the 5 D 0 → 7 F J (J = 0, 1, 2, 3, 4) transitions, which overlap with far‐red light required for photosynthesis. However, achieving high‐efficiency emission of remains challenging due weak 4 transition and concentration quenching. The study constructs two anomalously efficient garnet A 3 Sc 2 C O 12 (A Y , Gd . Al Ga ):Eu high‐resolution STEM measurement equipped an aberration corrector provides direct proofs both [EuO 8 ] configuration‐dependent strong origin high quenching concentration. Excitedly, two‐component substitution (replacing ‐Al ‐Ga ) triggers near‐unity internal quantum efficiency (IQE 99.01%) external (EQE 38.73%) :60%Eu resulting from effective modulation / transitions. LEDs device based on exhibits output power 113 mW at 300 mA. Subsequently, practical applications growth underscore significance these findings. This work opens new path development highly via synergistic effect square antiprism configuration

Language: Английский

Citations

1
Ultraviolet-Triggered Red-Emitting NaEuF4:Tb3+ Nanorods for White LED DOI
Taihui Chen,

Haoxuan Zeng,

Yongping Guo

et al.

ACS Applied Nano Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 14, 2025

With the development of solid-state lighting technology, high-efficiency phosphors (especially red phosphors) for near-ultraviolet LEDs have become increasingly important. In this paper, red-emitting NaEuF4:xTb3+ nanorods were successfully synthesized using a sacrificial template method at 150 °C and pH ∼ 7.5, with layered europium hydroxide Eu2(OH)5NO3·nH2O nanosheets as precursor NaF an anion source. The phase transition mechanism from to was studied by varying concentration ratio source template. Under excitation 394 nm, NaEuF4:10%Tb3+ exhibit optimal emission excellent thermal stability. addition, chip-pumped white LED prepared combining green-emitting (Sr, Ba)2SiO4:Eu2+ blue-emitting BaMgAl10O17:Eu2+. fabricated can emit good color coordinates (0.32, 0.33), high rendering index (93.4), low correlation temperature (6078 K). This work provides simple preparation in large quantity may be extended other types luminescent nanomaterials.

Language: Английский

Citations

1
Optimizing Europium-Doped Eulytite Phosphors: Unveiling the Effects of Concentration and Temperature for Enhanced LED and Optical Thermometric Applications DOI

Kavia J. Albert,

S. Masilla Moses Kennedy

Journal of Luminescence, Journal Year: 2025, Volume and Issue: unknown, P. 121122 - 121122

Published: Feb. 1, 2025

Language: Английский

Citations

1
Thermal-stability synergy improvement of Sm3+ and Eu3+ in Ca3.6In3.6(PO4)6: the effect of local symmetry DOI
Rongrong Wang, Guihua Li, Gemei Cai

et al.

Journal of Materials Chemistry C, Journal Year: 2023, Volume and Issue: 11(10), P. 3616 - 3625

Published: Jan. 1, 2023

In Ca 3.6 (PO 4 ) 6 , co-doping increased local symmetry and triggered the synergy enhancement of Eu 3+ or Sm emission in thermal stability. High TQ, good QE excellent color made these new red phosphors potentially useful high quality WLEDs.

Language: Английский

Citations

17
High quenching concentration of the CaLuAlO4:Er3+ upconversion phosphor with short-range energy migration DOI
Tian Luo, Yujie Sun, Ruonan Wang

et al.

Applied Physics Letters, Journal Year: 2024, Volume and Issue: 124(3)

Published: Jan. 15, 2024

Low activator concentration in upconversion phosphors has been a hindrance improving luminescence performance. Herein, we report an Er3+ doping as high 30 at. % the CaLuAlO4 host. The CaLuAlO4:Er3+ were prepared by traditional high-temperature solid-state method. Under excitation of 980 nm laser, optimal approaches 30% according to total integrated intensity red and green luminescence. This quenching is one order magnitude higher than that doped polycrystals. results obtained from first-principles calculations suggest there are no in-plane or chain rare-earth ions cell. increases difficulty propagating energy quench centers advantageous for concentration. Our work can spark people's interest research application highly phosphors.

Language: Английский

Citations

7
A novel red-emitting Bi2Mo3O12:Eu3+ down-shifting phosphor with a wide excitation band for multiple applications DOI
Jinjie Zheng, Honglie Shen, Yufang Li

et al.

Journal of Alloys and Compounds, Journal Year: 2024, Volume and Issue: 1003, P. 175566 - 175566

Published: July 15, 2024

Language: Английский

Citations

7
Sb3+/Sm3+ Codoped Cs2NaScCl6 All-Inorganic Double Perovskite: Blue Emission of Self-Trapped Excitons and Red-Emission via Energy Transfer DOI

Xunliang Jiang,

Haoqing Ding,

Yang Fengxi

et al.

Inorganic Chemistry, Journal Year: 2024, Volume and Issue: 63(23), P. 10756 - 10766

Published: May 29, 2024

The lead-free halide perovskites possess nontoxicity and excellent chemical stability, whereas relatively weak luminescence intensity limits their potential in practical applications. Therefore, strengthening the expanding application fields are urgent tasks for development of perovskites. In this paper, antimony-doped Cs2NaScCl6 crystals synthesized by a solvothermal method emit bright, deep blue photoluminescence at 447 nm. (PL), excitation (PLE), absorption spectra demonstrate that Sb3+ doping effectively activate intrinsic "dark self-trapped exciton (STE)," leading to an impressive quantum yield (PLQY) value 78.31% 1% doping. Furthermore, remains above 92% compared with fresh sample without secondary phases detected even after 90 days under environmental conditions. To expand emission spectra, rare-earth Sm3+ is further incorporated into Cs2NaScCl6:1% crystals. results show Sb ions not only enhance STE but also serve as sensitizers boost red-light Sm3+, significant 500-fold increase red intensity. Finally, PLQY reaches stunning 86.78%. These findings provide valuable insights design ion-doped double perovskites, broadening various optoelectronic devices.

Language: Английский

Citations

6
Modulating A site compositions of europium(iii)-doped double-perovskite niobate phosphors DOI
Yongbin Hua, Tian Wang, Jae Su Yu

et al.

Inorganic Chemistry Frontiers, Journal Year: 2022, Volume and Issue: 9(23), P. 6211 - 6224

Published: Jan. 1, 2022

Eu 3+ -activated double-perovskite niobates of A 2 InNbO 6 were synthesized with the modulation their site and polydimethylsiloxane flexible light-emitting films based on optimized phosphors implemented for versatile applications.

Language: Английский

Citations

24
Full-visible-spectrum LED lighting by using a near-UV-excitable broadband blue-emitting Ca2LuHf2GaAl2O12:Ce3+ garnet phosphor DOI
Zhe Xü, Lina Cao,

Jingming Chan

et al.

Ceramics International, Journal Year: 2023, Volume and Issue: 50(4), P. 7048 - 7058

Published: Dec. 9, 2023

Language: Английский

Citations

13
Structural Confinement Helps Achieve More Accurate Energy Transfer: Studies on the Garnet Structural NYGIG:Tb3+,Eu3+ Phosphors DOI
Jiajun Feng, Jie Wang,

Huazheng Chen

et al.

Materials Chemistry Frontiers, Journal Year: 2024, Volume and Issue: 8(23), P. 3962 - 3972

Published: Jan. 1, 2024

Structural confinement in sodium-rich garnets enables more accurate Tb 3+ –Eu energy transfer, enhancing luminescence performance. The Na + -doped system shows an transfer efficiency of 95% and stable emission for WLED applications.

Language: Английский

Citations

5