Broadening Phosphor-Converted Light-Emitting Diode Emission: Controlling Disorder DOI
Chih‐Yu Chang, Natalia Majewska, Kuan‐Chun Chen

et al.

Chemistry of Materials, Journal Year: 2022, Volume and Issue: 34(22), P. 10190 - 10199

Published: Nov. 7, 2022

Near-infrared (NIR) phosphor-converted light-emitting diodes (pc-LEDs) are a highly efficient perspective NIR light source, with application hindered by narrow emission band. In this work, we broaden the of new series phosphors controlling crystal structure disorder through cation cosubstitution. By substituting Ga3+ (Al0.68In0.32)3+, create Ga2–x(Al0.68In0.32)xO3:Cr3+ phosphor in which average size is maintained, while varies. The increased deviation radii substitution leads to electron–phonon coupling, resulting spectrum covering 650–1000 nm range 30% increase full width at half-maximum (FWHM) and relatively high internal quantum efficiency ∼80%. A transition from β phase α phase, differs undoped parent, created pressure possesses ultra-broad-band an FWHM ∼190 nm. This work shows that bandwidth can be controlled its influence on Stokes shift, as captured effective Huang–Rhys factor.

Language: Английский

Spotlight on Luminescence Thermometry: Basics, Challenges, and Cutting‐Edge Applications DOI
Carlos D. S. Brites, Riccardo Marin, Markus Suta

et al.

Advanced Materials, Journal Year: 2023, Volume and Issue: 35(36)

Published: July 21, 2023

Abstract Luminescence (nano)thermometry is a remote sensing technique that relies on the temperature dependency of luminescence features (e.g., bandshape, peak energy or intensity, and excited state lifetimes risetimes) phosphor to measure temperature. This provides precise thermal readouts with superior spatial resolution in short acquisition times. Although thermometry just starting become more mature subject, it exhibits enormous potential several areas, e.g., optoelectronics, photonics, micro‐ nanofluidics, nanomedicine. work reviews latest trends field, including establishment comprehensive theoretical background standardized practices. The reliability, repeatability, reproducibility are also discussed, along use multiparametric analysis artificial‐intelligence algorithms enhance readouts. In addition, examples provided underscore challenges faces, alongside need for continuous search design new materials, experimental techniques, procedures improve competitiveness, accessibility, popularity technology

Language: Английский

Citations

191
Luminescence thermometry with transition metal ions. A review DOI Creative Commons
Ł. Marciniak, K. Kniec, K. Elżbieciak-Piecka

et al.

Coordination Chemistry Reviews, Journal Year: 2022, Volume and Issue: 469, P. 214671 - 214671

Published: June 21, 2022

Transition metal (TM) ion activated phosphors are increasingly being used as probes for luminescence thermometry. Their is characterized by strong absorption and emission bands that span the visible near-infrared spectral ranges highly susceptible to temperature variations. Due latter characteristic, sensitive reliable remote measurements can be performed observing temperature-induced changes in TM intensities, bandwidths bandshifts, excited state lifetimes, well dependences of intensity ratios between various single or double phosphors. This review provides a systematic analysis performances luminescent thermometers based on different ions discusses relations among spectroscopic properties, characteristics host material structure, thermometric performance. Particular attention given engineering energy transfer other dopant obtain thermometers. Finally, several typical application examples from recent literature highlighted.

Language: Английский

Citations

145
One ion to catch them all: Targeted high-precision Boltzmann thermometry over a wide temperature range with Gd3+ DOI Creative Commons
Dechao Yu, Huaiyong Li, Dawei Zhang

et al.

Light Science & Applications, Journal Year: 2021, Volume and Issue: 10(1)

Published: Nov. 22, 2021

Abstract Ratiometric luminescence thermometry with trivalent lanthanide ions and their 4f n energy levels is an emerging technique for non-invasive remote temperature sensing high spatial temporal resolution. Conventional ratiometric often relies on thermal coupling between two closely lying governed by Boltzmann’s law. Despite its simplicity, Boltzmann excited allows precise sensing, but only within a limited range. While low temperatures slow down the nonradiative transitions required to generate measurable population in higher excitation level, that are too favour equalized populations of levels, at expense relative sensitivity. In this work, we extend concept more than provide quantitative guidelines link choice gaps multiple states performance different windows. By approach, it possible retain sensitivity precision measurement over wide range same system. We demonstrate using YAl 3 (BO ) 4 (YAB):Pr 3+ , Gd 6 P J crystal field spin-orbit split UV avoid black body background even highest temperatures. This phosphor easily excitable inexpensive powerful blue LEDs 450 nm. Zero-background realized blue-to-UV transfer upconversion Pr −Gd couple upon visible method us cover window 30 800 K.

Language: Английский

Citations

127
Efficient luminescence lifetime thermometry with enhanced Mn4+-activated BaLaCa1−xMgxSbO6 red phosphors DOI

Guixian Li,

Gan Li, Qinan Mao

et al.

Chemical Engineering Journal, Journal Year: 2021, Volume and Issue: 430, P. 132923 - 132923

Published: Oct. 14, 2021

Language: Английский

Citations

120
Ab Initio Site‐Selective Occupancy and Luminescence Enhancement in Broadband NIR Emitting Phosphor Mg7Ga2GeO12:Cr3+ DOI

Jinmeng Xiang,

Xue Zhou, Xiaoqi Zhao

et al.

Laser & Photonics Review, Journal Year: 2023, Volume and Issue: 17(7)

Published: March 15, 2023

Abstract Cr 3+ activated near‐infrared (NIR) phosphors are getting unprecedented attention to fabricate the broad band NIR light emitting diodes (NIR‐LEDs) for nondestructive detection, bio‐imaging, and night vision. However, it remains a major challenge obtain ultrabroadband phosphor with excellent quantum yield (QY). Here, broadband Mg 7 Ga 2 GeO 12 :Cr (MGGO: ) ranging from 600 1300 nm an outstanding QY (93%) large full width of half maximum (FWHM = 226 nm) is developed, in which site occupancy tendency MGGO host discussed detail through combining structure optimization first‐principles theory calculation luminescent properties at low temperature. After that, emission intensity MGGO:Cr improved partial substitution 2+ by alkaline‐earth ions Ca , Sr or Ba luminescence enhancement mechanism also investigated. Furthermore, pc‐LED device fabricated 450 blue LED chip brightest /Ba its potential applications evaluated field vision, bio‐imaging.

Language: Английский

Citations

96
Eu3+ Single-Doped Phosphor with Antithermal Quenching Behavior and Multicolor-Tunable Properties for Luminescence Thermometry DOI

Xinyang Shi,

Xue Yu,

Qinan Mao

et al.

Inorganic Chemistry, Journal Year: 2023, Volume and Issue: 62(2), P. 893 - 903

Published: Jan. 4, 2023

To date, non-contact luminescence thermometry methods based on fluorescence intensity ratio (FIR) technology have been studied extensively. However, designing phosphors with high relative sensitivity (Sr) has become a research hotspot. In this work, Eu3+ single-doped Ca2Sb2O7:Eu3+ Sr value for dual-emitting-center are developed and proposed. The anti-thermal quenching behavior of originating from the energy transfer (ET) host → is found proved in designed phosphors. Interestingly, adjustable color emission blue to orange can be achieved. Surprisingly, degree gradually reduces 240 127% as doping content increases 0.005 0.05 mol, attributed most being located low symmetrical [Ca1O8] dodecahedral site. According differentiable responses temperature, maximal reaches 3.369% K-1 (383 K). Moreover, ambient temperature intuitively predicted by observing emitting color. Owing excellent performance optical thermometry, color-tunable properties, outstanding acid alkali resistance polydimethylsiloxane (PDMS) films, expected prospective candidates thermometers LED devices various conditions.

Language: Английский

Citations

60
Structurally induced tuning of the relative sensitivity of LaScO3:Cr3+ luminescent thermometers by co-doping lanthanide ions DOI
K. Elżbieciak-Piecka, Markus Suta, Ł. Marciniak

et al.

Chemical Engineering Journal, Journal Year: 2021, Volume and Issue: 421, P. 129757 - 129757

Published: April 21, 2021

Language: Английский

Citations

69
Rationalizing the Thermal Response of Dual‐Center Molecular Thermometers: The Example of an Eu/Tb Coordination Complex DOI
Albano N. Carneiro Neto, Ekaterina Mamontova, Alexandre M. P. Botas

et al.

Advanced Optical Materials, Journal Year: 2021, Volume and Issue: 10(5)

Published: Dec. 22, 2021

Abstract Luminescence thermometry allows the remote monitoring of temperature and holds promise to drive next generation future nano or micrometric devices. Materials able sense are usually based on one several lanthanide ions allowing a ratiometric measurement. Optimizing thermometric features is achieved through serendipity approach, but it still appears difficult accurately predict sensing performance. Through combination experiment theoretical calculations, first example an energy‐driven luminescent molecular thermometer [Tb 0.94 Eu 0.06 (bpy) 2 (NO 3 ) ] (bpy = 2,2′‐bipydine) displaying exceptional thermal cyclability around room reported, for which properties could be theoretically forecasted. This work provides comprehensive guidelines that can easily extended any dual‐center in energy transfer drives performance opening avenue smart engineering

Language: Английский

Citations

65
High-sensitivity and wide-temperature-range dual-mode optical thermometry under dual-wavelength excitation in a novel double perovskite tellurate oxide DOI

Zhaojie Wu,

Li Li,

Guang Tian

et al.

Dalton Transactions, Journal Year: 2021, Volume and Issue: 50(33), P. 11412 - 11421

Published: Jan. 1, 2021

The high-sensitivity and wide-temperature-range dual-mode optical thermometry for novel double perovskite SrLaLiTeO 6 :Mn 4+ ,Dy 3+ phosphor was exploited. Notably, the relative sensitivity ( S R ) values can be manipulated by different excitation wavelength.

Language: Английский

Citations

64
How to Achieve Excellent Luminescence Properties of Cr Ion‐Doped Near‐Infrared Phosphors DOI Open Access

Guohui Wei,

Panlai Li, Rui Li

et al.

Advanced Optical Materials, Journal Year: 2023, Volume and Issue: 11(24)

Published: Oct. 11, 2023

Abstract Transition metal chromium (Cr) ion‐doped inorganic materials exhibit distinct tunable broadband near‐infrared luminescence, and they have promising applications including nondestructive composition analysis, night vision, biomedicine, plant illumination, afterglow anticounterfeiting. Currently, the most critical issue is to optimize their full width at half maxima, thermal stability, internal/external quantum efficiency. This review systematically summarizes strategies effectively improve photoluminescence performance of near‐infrared‐emitting with transition ions. Key examples design preparation Cr luminescence different modes, a detailed discussion properties luminescent materials, summary generic help explore novel efficient Cr‐doped phosphor are provided. Next, latest developments trends in these presented for variety application scenarios. Finally, future research directions new challenges faced also discussed.

Language: Английский

Citations

42