Advanced Optical Materials
·
2025
·Vol. 13
·期 36
·e03160
·
IF 7.2
Wenlong Ma,Die Xu,Long Zhao,Tongtong Xuan,Xuejiao Wang,Rong-Jun Xie,Xiaojun Wang
Overcoming the long-standing “cyan gap” remains a critical challenge in the development of full-spectrum white light-emitting diodes (wLEDs). In this work, a 0D cyan–green-emitting phosphor, Cs 3 LuCl 6 : Sb 3+ , synthesized via a facile HCl-assisted solid-state method is presented. Under 365 nm excitation, Cs 3 LuCl 6 : Sb 3+ exhibits a broad emission band centered at 525 nm with a full width at half maximum (FWHM) of ≈105 nm and an exceptional photoluminescence quantum yield (PLQY) of 99%. Hybrid density functional theory calculations reveal that Sb 3+ incorporation narrows the bandgap from 5.96 to 3.75 eV and induces strong hybridization among Sb 5s, Cl 3p, and Lu 5d orbitals, promoting the formation and radiative recombination of self-trapped excitons. Temperature-dependent photoluminescence measurements confirm robust thermal stability, with 82% of the emission intensity retained at 398 K and an activation energy of 0.3488 eV. When integrated with BaMgAl 10 O 17 :Eu 2+ (blue) and K 2 SiF 6 :Mn 4+ (red) on a 365 nm UV LED chip, the fabricated wLEDs achieve a high color rendering index (CRI) of 94 and a correlated color temperature (CCT) of 5565 K. These results establish Cs 3 LuCl 6 : Sb 3+ as a highly promising cyan–green phosphor for full-spectrum wLEDs.
研究领域:
材料科学
·
光电子学
·
固态照明
·
荧光粉化学
·
发光材料
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2024
·
IF 3.3
Changlin Li,Siyu Cheng,Yilian Ran,Xiya Miao,Dongze Li,Yangyu Su,Yuchen Yang,Xianchao Du,Xiang Liu,Ruijin Yu
The novel orange-red emitting K 5 Y(MoO 4 ) 4 : x Sm 3+ (KYMO: x Sm 3+ ) (1 mol% ≤ x ≤ 35 mol%) phosphors were synthesized through solid-phase reaction. The KYMO:Sm 3+ phosphors were mainly analyzed for purity phase, luminescence properties, and thermostability. Under 403 nm excitation, KYMO:10 mol%Sm 3+ possesses four distinct emission peaks. The dominant emission peak is situated at 645 nm, corresponding to the 4 G 5/2 → 6 H 7/2 electron transitions. With x = 10 mol%, the KYMO: x Sm 3+ phosphor has the optimal doping concentration. The color purity reaches as high as 99.9 %. KYMO:10 mol%Sm 3+ presents good thermostability with T 0.5 > 480 K and resistance to color drift (Δ E = 0.012 at 420 K). The lifetime for KYMO:10 mol%Sm 3+ is 1.16 ms. The internal quantum efficiency (IQE) reaches 62.74 %. At 480 K, the maximum temperature sensing sensitivities of the FIR of I 564 /I 599 are 5.19 × 10 −4 ( S a ) and 18 % ( S r ). The assembled WLED displays an excellent color rendering index (CRI, R a ) of 94, Commission International de L′ Eclairage (CIE) coordinates (0.333, 0.346), and a correlated color temperature (CCT) of 5464 K. In summary, KYMO:Sm 3+ phosphors possess great promise for high CRI white-light-emitting diodes (WLEDs) and potential feasibility for temperature sensing.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2025
·
IF 4.2
Houteng Zhao,Xuemei Yao,Xinyi Tian,Liqing Guo,Siyu Cheng,Yilian Ran,Dongze Li,Di Gao,Hanxin He,Shu-Wei Chen,Xiang Liu,Yuchen Yang,Ruijin Yu
A series of novel single-phase oxyapatite-type Eu 3+ -doped Ba 2 La 3 (SiO 4 ) 2 (PO 4 )O (BLSPO) phosphors for the first time were synthesized by means of a high-temperature solid-state reaction. The prepared phosphors were analyzed in terms of phase purity using X-ray diffraction (XRD) and Rietveld refinement. The BLSPO:Eu 3+ phosphors pertain to the hexagonal crystal structure and the P 6 3 / m (No.176) space group. BLSPO as an indirect bandgap semiconductor, has been experimentally determined to possess a bandgap energy of 4.85 eV, while theoretical calculations yield a value of 4.45 eV. The photoluminescence excitation of BLSPO:Eu 3+ exhibits the highest peak at 393 nm. Four distinct characteristic peaks are observed in the emission spectrum of BLSPO:Eu 3+ . Notably, the peak at 618 nm shows the highest emission intensity due to the radiative transition from 5 D 0 - 7 F 2 . By varying doping concentrations, it was determined that an optimal concentration of 0.30 mol Eu 3+ resulted in phosphors, with high color purity up to 100 %. At 420 K, the emission intensity of the BLSPO:0.30Eu 3+ phosphor can still maintain 66.8 % of the starting intensity observed at 300 K. The internal quantum efficiency (IQE) of BLSPO:0.30Eu 3+ is 74.7 %. The Commission International de L'Eclairage (CIE) color coordinate of w-LED was measured as (0.328, 0.334), correlating to correlated color temperature (CCT) of 5706 K and exhibiting a good color rendering index (CRI, R a = 92). Additionally, the BLSPO:0.30Eu 3+ phosphor surface was functionalized with oleic acid (OA) (BLSPO:0.30Eu 3+ @OA) to help identify fingerprint details at levels I-III details with high contrast and high resolution. Excellent visualization of latent fingerprints (LFPs) was observed on different substrates. In conclusion, high-efficiency oxyapatite-based BLSPO:Eu 3+ phosphors have attractive potential for w-LED and LFP applications.
研究领域:
材料科学
·
光学
·
法医学
✓ 已验证
产品关联
DOI
高影响因子
BIORESOURCE TECHNOLOGY
·
2018
·
IF 5.807
Shaozhe Cheng,Hua Yu,Meng Hu,Yue Wu,Liangliang Cheng,Qiuming Cai,Yuanyuan Tu,Tao Xia,Liangcai Peng
In this study, total eight distinct Miscanthus accessions were collected from the cadmium (Cd)-supplied soil pots, and mild alkali pretreatments (0.5%, 1% NaOH) were then performed to enhance biomass enzymatic saccharification. Due to large Cd accumulation, all Miscanthus accessions showed significantly reduced cellulose levels and features (CrI, DP) with much increased hemicellulose and pectin contents in the mature stems. Under mild alkali pretreatments, all Miscanthu s samples exhibited largely increased hexoses yields released from enzymatic hydrolysis, and one desirable accession had an almost complete biomass saccharification with the hexoses yield at 100% (% cellulose). Notably, the biomass residues remained from enzymatic hydrolysis upon 1% NaOH pretreatment could absorb 73–96% Cd (% of total), suggesting an applicable approach for Cd phyto-remediation. Hence, a hypothetic model was proposed to elucidate that the enhanced biomass saccharification should be mainly due to much reduced cellulose CrI and DP in the Cd-accumulated Miscanthus accessions.
研究领域:
植物学
·
环境科学
·
生物能源
✓ 已验证
产品关联
DOI
PubMed
高影响因子
DALTON TRANSACTIONS
·
2021
·Vol. 51
·期 2
·645-654
·
IF 4.39
Qinghong Meng,Guoying Zhao,Qi Zhu,Xiaodong Li,Xudong Sun,Ji-Guang Li
Synergistic doping of the metastable Gd3Al5O12:Ce garnet with a Ca2+/Hf4+ pair and Sc3+ to form Gd2.97−xCaxHfxScyAl3O12:0.03Ce (x = 0.5–2.0, y = 0.0–1.5, x + y = 2.0) solid solution was conducted for the structural stabilization and photoluminescence manipulation. The site selection of Ca2+/Hf4+/Sc3+ dopants and the effects of doping on the crystal structure, local coordination, band structure and Ce3+ luminescence were revealed in detail with the results of XRD, Rietveld refinement, TEM, and UV-Vis/photoluminescence spectroscopy. A decrease in Ca2+/Hf4+ and an increase in the Sc3+ content were observed to shrink the lattice, widen the bandgap of the garnet host, red-shift the excitation/emission wavelength, broaden the emission band and shorten the fluorescence lifetime of Ce3+. The spectral changes were rationalized by considering the local coordination and crystal field splitting of the Ce3+ 5d energy level. Application of typical Gd0.97Ca2Hf2Al3O12:0.03Ce (x = 2.0, y = 0) cyan and Gd2.47Ca0.5Hf0.5Sc1.5Al3O12:0.03Ce (x = 0.5, y = 1.5) greenish-yellow phosphors in w-WLED lighting produced low correlated color temperatures of ∼3842 and 3514 K, high color rendering indices of ∼88 and 93 and favorable luminous efficacies of ∼32.9 and 14.7 lm/W under the excitation of 395 nm n-UV and 450 nm blue LED chips, respectively.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF LUMINESCENCE
·
2021
·
IF 3.599
Pinyi He,Su Yang,Xinghua Liu,Yongzhen Yang,Jingxia Zheng,Xuguang Liu,Bingshe Xu
Green-emitting graphene quantum dots (GQDs) with a high crystallization degree were prepared by a two-step solvothermal method . Owing to the co-doping of nitrogen and oxygen, carbonyl and amide groups were introduced into GQDs. The quantum yield (QY) of GQD solution is up to 47.09%, which is higher than that of other GQDs synthesized by top-down methods. Since GQD solution exhibits concentration-dependent photoluminescence (PL) properties, green, yellow, and orange emissions were realized by adjusting GQD concentration. A high concentration (no less than 6.0 mg mL −1 ) GQD solution was mixed with KH-792 to form a yellow-emitting fluorescent film with an excellent fluorescence and thermal stability, which was used as color converters and combined with 405 nm laser diodes (LDs) to realize the devices with white laser-emitting. The Commission Internationale de L'Eclairage (CIE) coordinate of the laser device is (0.34, 0.39), the correlated color temperature (CCT) is 5288 K, and the color rendering index (CRI) is 70. This work provides an advanced way for the development of laser fluorescent materials.
研究领域:
材料科学
·
光电技术
·
光子学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2024
·
IF 3.3
Ruifeng Liu,Yunluo Wang,Haoming Qin,Xuchang He,Shihao Ge,Jianghua Wu,Tianrui Zhou,Tingting Ye,Zesen Gao,Futing Sun,Jingshan Hou,Yihui He,Lianjun Wang,Haijie Chen,Wan Jiang
Lead-free halides, with the advantages of non-toxicity and high stability, have broad application prospects. Here, we studied the synthesis and luminescent properties of the Sb-doped Rb 2 ZnCl 4 and explored their utilizations for white light-emitting diode (WLED) and X-ray detection. The as-synthesized Rb 2- x Zn 1- x Sb x Cl 4 single crystals exhibit bright red emission centered at 740 nm with a large full width at half maximum (FWHM) of 220 nm, and the maximum photoluminescence quantum yield (PLQY) is determined to be 59.7 % for the sample with x = 0.01. The assembled WLED achieves a high color rendering index (CRI) of 93.6 and a low correlated color temperature (CCT) of 3755 K. Under continuous X-ray irradiation for 600 s at a dose rate of 26.5 Gy min −1 , the irradiation luminescence intensity of Rb 1.99 Zn 0.99 Sb 0.01 Cl 4 did not decrease, indicating that the single crystal has a high tolerance to X-ray irradiation. Our work demonstrates that Zn halides are also a promising lead-free family for multiple optoelectronic applications.
研究领域:
材料科学
·
光电子学
·
光子学
·
辐射检测
✓ 已验证
产品关联
DOI
高影响因子
Chemical Science
·
2024
·Vol. 15
·期 8
·2954-2962
·
IF 7.6
Chuying Wang,Wen Meng,Guigen Luo,Guangyong Xu,Min Peng,Bin Xu,Shuming Nie,Zhengtao Deng
Materials with two or more fluorescence features under different excitation sources have great potential in optical applications, but luminous materials with three emission characteristics have been largely undeveloped. Here, we report a novel zero-dimensional (0D) organic–inorganic hybrid ((C2H5)4N)2ZrCl6 perovskite with multiple emissions. The zirconium-based perovskite exhibits a red emission around 620 nm, a green emission at 527 nm, and a blue emission around 500 nm. The red and green emissions come from self-trapped excitons (STEs) and the d–d transitions of Zr(IV), respectively, which are caused by distortion of the [ZrCl6]2− octahedra. The blue emission is caused by thermally activated delayed fluorescence (TADF), which is similar to that of Cs2ZrCl6. The absolute photoluminescence quantum yield (PLQY) of the red and blue double emission is up to 83% and the PLQY of the green emission is 27%. With different combinations of ((C2H5)4N)2ZrCl6 samples, we achieve a variety of applications, including a two-color luminescent anti-counterfeiting device, a white light-emitting diode (WLED) with a color rendering index (CRI) of 95 and information encryption with different excitations. We also synthesize other hybrid zirconium perovskites with tri-luminescence through a similar method. Our work provides a potential set of excitation-dependent luminescent materials and is expected to expand the basic research and practical applications of multi-luminescence materials.
研究领域:
材料科学
·
光学
·
光子学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nano Energy
·
2019
·
IF 15.548
Hongling Guan,Shuangyi Zhao,Huaxin Wang,Dongdong Yan,Ming Wang,Zhigang Zang
White light emitting diodes (WLEDs) based on all-inorganic halide (CsPbX 3 , X = Cl, Br and I) perovskite quantum dots (QDs) have attracted broad attention due to their high brightness. However, their poor stability and anion-exchange reaction when utilized together are still the main challenges that impede their applications. Herein, a one-step in situ method under room temperature in air is proposed to synthesize CsPbBr 3 QDs coated with SiO 2 (CsPbBr 3 @SiO 2 ), where the whole process takes only 20 s. The as-prepared CsPbBr 3 @SiO 2 QDs samples present an enhanced stability in the thermal and polar-solvent environment, maintaining its high photoluminescence quantum yield (PLQY~75%). Thereby WLEDs are constructed by combining CsPbBr 3 @SiO 2 with red Ag–In–Zn–S QDs on InGaN blue chip, achieving a high color rendering index (CRI) of 91, a correlated color temperature (CCT) of 3689 K and a power efficiency of 40.6 lm W −1 .
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Xiao-Fei Wang,Gui-Gen Wang,Jia-Bing Li,Zheng Liu,You-Xiao Chen,Long-Fei Liu,Jie-Cai Han
Herein we first report new chlorine-doped graphene quantum dots (Cl-GQDs) that can be used in solid-state white-light-emitting diodes (WLEDs). The Cl-GQDs with a mean size of 1.53 nm are obtained by one-step hydrothermal method using β-cyclodextrin and hydrochloric acid as the source materials. The PL emission spectra of the Cl-GQDs show an excitation-wavelength-dependent behavior in the range from 300 to 380 nm excitation. Under UV irradiation, the Cl-GQDs can direct emit white light. Given that they are worth using in light-conversion, Cl-GQDs embedded solid composite film (Cl-ESCF), based on silicon resin as host material, is successfully fabricated by solution-processing approach. The freestanding Cl-ESCF has high transparency and flexibility, excellent photostability and temperature resistance, and retains its optical properties in the solid state. In order to realize its potential, the Cl-ESCF converted remote UV-pumped WLED is demonstrated. The results verify that the Cl-GQDs can be homogeneously dispersed within solid matrix without obvious aggregation so that a uniform and defect-free natural white light can be obtained. In addition, our WLED possesses favorable white-light characters with the CIE of (0.33, 0.34), moderate CCT of 5653 K, and high CRI of 87.6, as well as good color and LED stability. This single-phase rare-earth-free white-luminescent Cl-GQDs may be not only expected to prevent the drawbacks of multicolor phosphors, thereby generating high-quality white emission, but also identified to be a green alternative for conventional emitters.
研究领域:
材料科学
·
纳米技术
·
光电
·
光子学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）