兰州大学机构库
Robust thermal performance of red-emitting phosphor composites for white light-emitting diodes: Energy transfer and oxygen-vacancy induced electronic localization
Ullah Khan, Wasim1; Ullah Khan, Waheed2; Peng, Yan1; Cheng, Zhiyuan1; Saleh, Tawfik A.3; Zhang, Yueli1
2021-10-15
Source PublicationJournal of Colloid and Interface Science
ISSN0021-9797
Volume600Pages:219-228
AbstractCe3+ ion can effectively sensitize Sm3+ ion via energy transfer, and this phenomenon can led to the development of white light-emitting diodes (WLED). However, interestingly, high correlated color temperature (CCT), poor color-rending index (CRI), poor thermal stability, and low efficacy of available red phosphor still pose immense challenges. Herein, we undertook a combined analysis: X-ray diffraction (XRD), crystal refinement, electron spin resonance (ESR), transmission electron microscopy (TEM), scanning electron microscopy (SEM), and diffuse reflection spectroscopy (DRS). We also observed the optical properties of the resulting samples. The Ce3+ and Sm3+ dopants on the Sr2+ and La3+ sites in the mixed cation borate Sr3LaAl3B4O15 (SLAB) phosphors were quantitatively evaluated. A cerium ion merged as a sensitizer, improving the red emission intensity by enhancing it 3.9 times. The energy transfer (ET) between Ce3+ and Sm3+ was examined experimentally and with theoretical models as a function of Ce3+ concentrations at ambient temperatures. Several theoretical models were employed to simulate the luminescence decays of Ce3+ and Sm3+ doped samples at different doping levels and their transfer mechanisms were studied depending on forced electric dipole at each ion. Notably, the electronic sites created by the oxygen vacancies around the Ln3+ ions can effectively justify the highly efficient bluish-red phosphor. Additionally, the SL0.95AB:0.02Ce3+,0.03Sm3+ exhibited outstanding thermal-quenching (TQ) resistance and has > 94.8% intensity at 425 K. WLEDs made with the use of SL0.95AB:0.02Ce3+,0.03Sm3+ furnished an exceptional CRI exceeding 88 and low at CCT 4503 K. These results are superior to the parameters of commercial WLED containing Y3Al5O12:Ce3+ phosphor and blue LED chip (CCT≈7746 K, CRI≈75), and they could be a cornerstone for the fabrication of warm WLEDs. © 2021 Elsevier Inc.
KeywordAluminum compounds Energy transfer High resolution transmission electron microscopy Ions Lanthanum compounds Light Light emission Light emitting diodes Magnetic moments Optical properties Oxygen vacancies Phosphors Scanning electron microscopy Strontium compounds Yttrium aluminum garnet Correlated color temperature Diffuse reflection spectroscopy Electronic localization Luminescence decays Red emitting phosphor Thermal Performance Transfer mechanisms White light emitting diodes
PublisherAcademic Press Inc.
DOI10.1016/j.jcis.2021.04.139
Indexed ByEI
Language英语
EI Accession Number20212410502612
EI KeywordsElectron spin resonance spectroscopy
EI Classification Number701.2 Magnetism: Basic Concepts and Phenomena ; 714.2 Semiconductor Devices and Integrated Circuits ; 741.1 Light/Optics ; 741.3 Optical Devices and Systems ; 801 Chemistry ; 933.1 Crystalline Solids
Original Document TypeJournal article (JA)
Citation statistics
Cited Times:4[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.lzu.edu.cn/handle/262010/451840
Collection兰州大学
Corresponding AuthorSaleh, Tawfik A.
Affiliation1.State Key Laboratory of Optoelectronic Materials and Technologies, School of Materials Science and Engineering, Sun Yat-sen University, Guangzhou; 510275, China;
2.School of Physical Science and Technology, Lanzhou University, Lanzhou; 730000, China;
3.Department of Chemistry, King Fahd University of Petroleum & Minerals, Dhahran; 31261, Saudi Arabia
Corresponding Author AffilicationCollege of Chemistry and Chemical Engineering
Recommended Citation
GB/T 7714
Ullah Khan, Wasim,Ullah Khan, Waheed,Peng, Yan,et al. Robust thermal performance of red-emitting phosphor composites for white light-emitting diodes: Energy transfer and oxygen-vacancy induced electronic localization[J]. Journal of Colloid and Interface Science,2021,600:219-228.
APA Ullah Khan, Wasim,Ullah Khan, Waheed,Peng, Yan,Cheng, Zhiyuan,Saleh, Tawfik A.,&Zhang, Yueli.(2021).Robust thermal performance of red-emitting phosphor composites for white light-emitting diodes: Energy transfer and oxygen-vacancy induced electronic localization.Journal of Colloid and Interface Science,600,219-228.
MLA Ullah Khan, Wasim,et al."Robust thermal performance of red-emitting phosphor composites for white light-emitting diodes: Energy transfer and oxygen-vacancy induced electronic localization".Journal of Colloid and Interface Science 600(2021):219-228.
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