Dehydration-Triggered Afterglow Transition in a Mellitate-Based Coordination Polymer DOI
Shuang Wang,

Yin-Jing Shi,

Song Chen

et al.

Chemistry of Materials, Journal Year: 2023, Volume and Issue: 35(7), P. 3015 - 3023

Published: March 27, 2023

Stimulus-responsive long persistent luminescence (LPL) materials have attracted wide attention due to their potential applications in information storage, anti-counterfeiting, optoelectronic devices, etc. However, LPL coordination polymers with room temperature afterglow transition characteristics not been explored. Herein, mellitic acid and zinc ions were utilized synthesize an acid–base stable polymer (1) by organic solvent-free hydrothermal method. 1 possesses a tightly stacked structure exhibits dual-emission peaks blue blue-green afterglow. Upon exposure heating, DMSO immersion, or vacuum, 1h, 1s, 1v obtained. The original changes blue-green, while the turns yellow-green loss of water molecules from inner cavity. This is first example that can realize dehydration operation. Moreover, emission spectra be recovered exposing vapor, suggesting reversible dehydration/hydration process. Experimental density functional theory (DFT) results suggest fluorescence originates mixing intra-ligand ligand-to-metal charge transfer excited states. triplet state intersystem crossing responsible for phosphorescence emission. rational structural design along conceptual model anti-counterfeiting encryption based on display unique advantages realizing convenient multiple stimuli-responsive devices.

Language: Английский

Ce3+-Activated SrLu2Al3ScSiO12 Cyan-Green-Emitting Garnet-Structured Inorganic Phosphor Materials toward Application in Blue-Chip-Based Phosphor-Converted Solid-State White Lighting DOI
Xiaoyuan Chen, Xiaoyong Huang

Inorganic Chemistry, Journal Year: 2024, Volume and Issue: 63(12), P. 5743 - 5752

Published: March 13, 2024

Phosphor-converted white-light-emitting diodes (WLEDs) with superhigh color rendering index (CRI) are the ongoing pursuit of next-generation solid-state lighting. One most important challenges is limited improvement in CRI on account absence a cyan component typical commercial combination. Here, bright broad-band cyan-green-emitting phosphor cubic garnet structure, SrLu2Al3ScSiO12:Ce3+ (SLASSO:Ce3+), was successfully reported, which can compensate for cavity 480–520 nm blue-green emission region. With 439 blue-light irradiation, as-fabricated SLASSO:Ce3+ yields cyan-green maximum peak positioned at 525 and an appropriate full width half-maximum (fwhm) 111 nm, capable providing more without sacrificing green emission. Meanwhile, optimal SLASSO:2%Ce3+ features CIE coordinates (0.3254, 0.5470) hue, along high internal quantum efficiency up to 93%. Additionally, thermal stability measurements different temperatures reveal that luminescence intensity proposed retains 44% its original integral 423 K respect room temperature, while also demonstrating excellent (ΔE = 5.4 × 10–3). This work shows highly efficient be utilized as potential filling gap, resulting construction high-quality warm WLED "human-centric" sunlight-like full-spectrum illumination.

Language: Английский

Citations

23
High-performance green-emitting Ca2YScAl2Si2O12:Ce3+ garnet phosphors and their applications in high-quality blue-chip-pumped white LEDs DOI
Xian Cheng, Xiaoyuan Chen, Xiaoyong Huang

et al.

Journal of Materials Chemistry C, Journal Year: 2024, Volume and Issue: 12(32), P. 12378 - 12388

Published: Jan. 1, 2024

A new high-brightness broadband green-emitting Ca 2 YScAl Si O 12 :Ce 3+ garnet phosphor (IQE = 91.1%, EQE 51.7%) enables high-quality white LEDs ( R a 92.6, CCT 4726 K, LE 109.89 lm W −1 ).

Language: Английский

Citations

20
Achieving efficient violet-light-excited blue phosphors by nitridation for violet-chip-based full-spectrum lighting DOI
Chao Dou, Fangyi Zhao, Shengqiang Liu

et al.

Inorganic Chemistry Frontiers, Journal Year: 2023, Volume and Issue: 10(8), P. 2430 - 2437

Published: Jan. 1, 2023

By partially introducing N 3− into a matrix, new efficient and thermally stable Ba 0.697 Al 10.914 O 15.732 1.0 :0.16Eu 2+ blue phosphor has been synthesized, which can better match with violet chips for full-spectrum lighting.

Language: Английский

Citations

40
Near-UV-excitable broadband green-emitting Ca2LaHf2GaAl2O12:Ce3+ garnet-type phosphors for high color rendering warm-white LEDs DOI
Xiaoyong Huang, Zhe Xü, Balaji Devakumar

et al.

Ceramics International, Journal Year: 2023, Volume and Issue: 49(16), P. 26420 - 26427

Published: May 19, 2023

Language: Английский

Citations

37
Enhancing External Quantum Efficiency of Blue-Emitting Phosphor Ba(K)-β-Al2O3:Eu2+ by Lattice Site Engineering for Full-Spectrum Lighting DOI
Chao Dou, Shengqiang Liu,

Fangyi Zhao

et al.

Inorganic Chemistry, Journal Year: 2023, Volume and Issue: 62(25), P. 10021 - 10028

Published: June 13, 2023

The discovery of violet-excitable blue-emitting phosphor is a significant breakthrough for the development phosphor-converted full-spectrum white light-emitting diodes (WLEDs). However, application most known phosphors limited by their low external quantum efficiency (EQE). In this work, we reported on how EQE values Eu2+-doped Ba(K)-β-Al2O3 can be significantly improved through lattice site engineering. By partially substituting K+ Ba2+, Eu2+-occupied crystallographic changes and coordination polyhedron Eu2+ shrinks, leading to increase crystal field splitting. Consequently, excitation spectrum exhibits continuous red shift match violet excitation, which enhances PL intensity solid solution (Ba0.4K1.6)0.84Al22O35-α:0.32Eu2+ ((B0.4K1.6)0.84AO:Eu) 1.42 times compared that end-member Ba1.68Al22O35-α:0.32Eu2+ (B1.68AO:Eu) phosphor. Correspondingly, under 400 nm light optimal (B0.4K1.6)0.84AO:Eu up 53%. Additionally, also shows excellent resistance luminescence thermal quenching (95% at 150 °C). Finally, WLED fabricated based commercial green exhibited an ultra-high color rending index with Ra = 95.5 R1-R15 >90. This work offers guidance tuning spectral properties

Language: Английский

Citations

24
Highly Quantum Efficient and Thermally Stable Near‐Infrared‐Emitting K‐β‐Al2O3:Cr3+ Phosphor DOI Open Access
Chao Dou,

Chuxin Cai,

Zhen Song

et al.

Advanced Optical Materials, Journal Year: 2023, Volume and Issue: 12(4)

Published: Aug. 31, 2023

Abstract Near‐infrared (NIR) phosphors are enablers for NIR phosphor‐converted light‐emitting diodes (pc‐LEDs). However, fewer NIR‐emitting with both high internal/external quantum efficiency (IQE/EQE) and thermal stability discovered, which obstructs the promotion of pc‐LEDs. Herein, by partially replacing Al 3+ in K‐β‐Al 2 O 3 :2Cr Ga , photoluminescence (PL) intensity solid solution K 1+δ (Al 0.4 0.6 ) 11 17 (KA G O:Cr) phosphor is increased 2.75 1.25 times that end‐members (KAO:Cr) (KGO:Cr). The IQE/EQE optimal KA O:Cr reaches 88.9%/50.8% (77.4%@150 °C). PL enhancement due to Al/Ga‐6O octahedral volume distortion variation caused substitution 1‐y ,Ga y O:Cr), leads forbidden d–d transition being broken crystal field strength varied. Finally, a pc‐LED device fabricated based on blue chip an electro‐optical 16.3% under drive current 100 mA. Meanwhile, non‐destructive detection plant germination applications demonstrated. These results prove promising diverse applications.

Language: Английский

Citations

23
Stimulated-source-independent persistent luminescence phosphor Sr2Ta2O7:Tb3+, Tm3+ for multi-mode anti-counterfeiting applications DOI

Zexun Li,

Jinmeng Xiang,

Changheng Chen

et al.

Journal of Materials Chemistry C, Journal Year: 2024, Volume and Issue: 12(16), P. 5727 - 5736

Published: Jan. 1, 2024

The multi-mode luminescent anti-counterfeiting materials Sr 2 Ta O 7 :Tb 3+ , Tm were prepared, which possessed DC, UC, PSL, and PersL modes.

Language: Английский

Citations

15
Highly efficient and thermally stable broadband green-emitting BaY2Sc2Al2SiO12:Ce3+ phosphors enabling warm-white LEDs with high luminous efficacy and high color rendering index DOI
Xiaoyuan Chen, Xiaoyong Huang

Journal of Materials Chemistry C, Journal Year: 2024, Volume and Issue: 12(41), P. 16741 - 16750

Published: Jan. 1, 2024

A broadband green-emitting BaY 2 Sc Al SiO 12 :Ce 3+ garnet phosphor enables warm-white LEDs with high R a of 93.3 and LE 105.3 lm W −1 .

Language: Английский

Citations

13
Highly efficient blue-light-excitable ultra-broadband orange-emitting Mg2.5Y1.5Al1.5Si2.5O12:Ce3+ garnet phosphors for solid-state lighting DOI
Xiaoyuan Chen, Xiaoyong Huang

Journal of Alloys and Compounds, Journal Year: 2024, Volume and Issue: 997, P. 174906 - 174906

Published: May 20, 2024

Language: Английский

Citations

12
Efficient Deep-Blue Light-Emitting Diodes from Highly Luminescent Eu2+-Doped Alkali Metal Halide Nanocrystals via Lattice Field Modulation DOI
Li Xu, Xu Chen, Huifang Jiang

et al.

Nano Letters, Journal Year: 2024, Volume and Issue: 24(22), P. 6601 - 6609

Published: May 24, 2024

Lead-halide perovskite nanocrystals (NCs) are promising for fabricating deep-blue (<460 nm) light-emitting diodes (LEDs), but their development is plagued by low electroluminescent performance and lead toxicity. Herein, the synthesis of 12 kinds highly luminescent eco-friendly europium (Eu2+)-doped alkali-metal halides (AX:Eu2+; A = Na+, K+, Rb+, Cs+; X Cl–, Br–, I–) NCs reported. Through adjustment coordination environment, efficient emission from Eu-5d → Eu-4f transitions realized. The representative CsBr:Eu2+ exhibit a high photoluminescence quantum yield 91.1% at 441 nm with color coordinate (0.158, 0.023) matching Rec. 2020 blue specification. Electrically driven LEDs demonstrated, achieving record external efficiency 3.15% half-lifetime ∼1 h, surpassing reported metal-halide NCs-based LEDs. Importantly, large-area an emitting area 12.25 cm2 realized uniform emission, representing milestone toward commercial display applications.

Language: Английский

Citations

11