Iridium-Based Time-Resolved Luminescent Sensor for Ba2+ Detection

The NEXT collaboration

doi:10.1021/acssensors.4c01892

Iridium-Based Time-Resolved Luminescent Sensor for Ba²⁺ Detection

The NEXT collaboration

Racah Institute of Physics

Research output: Contribution to journal › Article › peer-review

Abstract

We present a new time-resolved chemosensor for the detection of Ba²⁺ ions. Our sensor is based on an iridium(III) compound with dual (fluorescent and phosphorescent) emission. The nature of the luminescence response of the sensor depends on its state; specifically, the phosphorescence emission of the free state at long wavelengths is strongly suppressed, while that of the Ba²⁺-chelated compound is strongly enhanced. Furthermore, the residual phosphorescence emission of the free compound decays with two short decay constants, τ_free¹ ∼ 3.5 ns (88%) and τ_free² ∼ 209 ns (12%), while the chelated compound decays with two long decay constants, τ_bound¹ ∼ 429 ns (21%) and τ_bound² ∼ 1128 ns (76%). This exceptional behavior, supported by quantum chemical calculations, allows a time-based separation between the signals of the free and the chelated species. Among other applications, our sensor could be the basis of a Ba²⁺ tagging detector for neutrinoless double beta decay searches in xenon.

Original language	English
Journal	ACS Sensors
DOIs	https://doi.org/10.1021/acssensors.4c01892
State	Accepted/In press - 2025

Bibliographical note

Publisher Copyright:
© 2025 American Chemical Society.

Keywords

dual emitter
iridium
ratiometric
sensors
time-resolved luminescence

Access to Document

10.1021/acssensors.4c01892

Cite this

@article{6b5d23c90c21494e8ba78a14dc4a9a8f,

title = "Iridium-Based Time-Resolved Luminescent Sensor for Ba2+ Detection",

abstract = "We present a new time-resolved chemosensor for the detection of Ba2+ ions. Our sensor is based on an iridium(III) compound with dual (fluorescent and phosphorescent) emission. The nature of the luminescence response of the sensor depends on its state; specifically, the phosphorescence emission of the free state at long wavelengths is strongly suppressed, while that of the Ba2+-chelated compound is strongly enhanced. Furthermore, the residual phosphorescence emission of the free compound decays with two short decay constants, τfree1 ∼ 3.5 ns (88%) and τfree2 ∼ 209 ns (12%), while the chelated compound decays with two long decay constants, τbound1 ∼ 429 ns (21%) and τbound2 ∼ 1128 ns (76%). This exceptional behavior, supported by quantum chemical calculations, allows a time-based separation between the signals of the free and the chelated species. Among other applications, our sensor could be the basis of a Ba2+ tagging detector for neutrinoless double beta decay searches in xenon.",

keywords = "dual emitter, iridium, ratiometric, sensors, time-resolved luminescence",

author = "{The NEXT collaboration} and Aranburu, {Ane I.} and Mikel Elorza and Valle, {Pablo R.G.} and Ariadna Pazos and Alexey Brodolin and Pablo Herrero-G{\'o}mez and Barcelon, {J. Eduardo} and Gabriel Molina-Terriza and Francesc Monrabal and Celia Rogero and Coss{\'i}o, {Fernando P.} and G{\'o}mez-Cadenas, {Juan Jos{\'e}} and Claire Tonnel{\'e} and Zoraida Freixa and C. Adams and H. Almaz{\'a}n and V. {\'A}lvarez and B. Aparicio and Aranburu, {A. I.} and L. AraziI and J. Arnquist and F. Auria-Luna and S. Ayet and Azevedo, {C. D.R.} and K. Bailey and F. Ballester and Barcelon, {J. E.} and {del Barrio-Torregrosa}, M. and A. Bayo and Benlloch-Rodriguez, {J. M.} and Borges, {F. I.G.M.} and A. Brodolin and N. Byrnes and G{\'o}mez-Cadenas, {J. J.} and S. Ca{\'r}cel and A. Castillo and S. Cebri{\'a}n and E. Church and L. Cid and Conde, {C. A.N.} and T. Contreras and Coss{\'i}o, {F. P.} and E. Dey and G. D{\'i}az and T. Dickel and C. Echevarria and M. Elorza and J. Escada and R. Esteve and I. Shomroni",

note = "Publisher Copyright: {\textcopyright} 2025 American Chemical Society.",

year = "2025",

doi = "10.1021/acssensors.4c01892",

language = "אנגלית",

journal = "ACS Sensors",

issn = "2379-3694",

publisher = "American Chemical Society",

}

TY - JOUR

T1 - Iridium-Based Time-Resolved Luminescent Sensor for Ba2+ Detection

AU - The NEXT collaboration

AU - Aranburu, Ane I.

AU - Elorza, Mikel

AU - Valle, Pablo R.G.

AU - Pazos, Ariadna

AU - Brodolin, Alexey

AU - Herrero-Gómez, Pablo

AU - Barcelon, J. Eduardo

AU - Molina-Terriza, Gabriel

AU - Monrabal, Francesc

AU - Rogero, Celia

AU - Cossío, Fernando P.

AU - Gómez-Cadenas, Juan José

AU - Tonnelé, Claire

AU - Freixa, Zoraida

AU - Adams, C.

AU - Almazán, H.

AU - Álvarez, V.

AU - Aparicio, B.

AU - Aranburu, A. I.

AU - AraziI, L.

AU - Arnquist, J.

AU - Auria-Luna, F.

AU - Ayet, S.

AU - Azevedo, C. D.R.

AU - Bailey, K.

AU - Ballester, F.

AU - Barcelon, J. E.

AU - del Barrio-Torregrosa, M.

AU - Bayo, A.

AU - Benlloch-Rodriguez, J. M.

AU - Borges, F. I.G.M.

AU - Brodolin, A.

AU - Byrnes, N.

AU - Gómez-Cadenas, J. J.

AU - Caŕcel, S.

AU - Castillo, A.

AU - Cebrián, S.

AU - Church, E.

AU - Cid, L.

AU - Conde, C. A.N.

AU - Contreras, T.

AU - Cossío, F. P.

AU - Dey, E.

AU - Díaz, G.

AU - Dickel, T.

AU - Echevarria, C.

AU - Elorza, M.

AU - Escada, J.

AU - Esteve, R.

AU - Shomroni, I.

PY - 2025

Y1 - 2025

N2 - We present a new time-resolved chemosensor for the detection of Ba2+ ions. Our sensor is based on an iridium(III) compound with dual (fluorescent and phosphorescent) emission. The nature of the luminescence response of the sensor depends on its state; specifically, the phosphorescence emission of the free state at long wavelengths is strongly suppressed, while that of the Ba2+-chelated compound is strongly enhanced. Furthermore, the residual phosphorescence emission of the free compound decays with two short decay constants, τfree1 ∼ 3.5 ns (88%) and τfree2 ∼ 209 ns (12%), while the chelated compound decays with two long decay constants, τbound1 ∼ 429 ns (21%) and τbound2 ∼ 1128 ns (76%). This exceptional behavior, supported by quantum chemical calculations, allows a time-based separation between the signals of the free and the chelated species. Among other applications, our sensor could be the basis of a Ba2+ tagging detector for neutrinoless double beta decay searches in xenon.

AB - We present a new time-resolved chemosensor for the detection of Ba2+ ions. Our sensor is based on an iridium(III) compound with dual (fluorescent and phosphorescent) emission. The nature of the luminescence response of the sensor depends on its state; specifically, the phosphorescence emission of the free state at long wavelengths is strongly suppressed, while that of the Ba2+-chelated compound is strongly enhanced. Furthermore, the residual phosphorescence emission of the free compound decays with two short decay constants, τfree1 ∼ 3.5 ns (88%) and τfree2 ∼ 209 ns (12%), while the chelated compound decays with two long decay constants, τbound1 ∼ 429 ns (21%) and τbound2 ∼ 1128 ns (76%). This exceptional behavior, supported by quantum chemical calculations, allows a time-based separation between the signals of the free and the chelated species. Among other applications, our sensor could be the basis of a Ba2+ tagging detector for neutrinoless double beta decay searches in xenon.

KW - dual emitter

KW - iridium

KW - ratiometric

KW - sensors

KW - time-resolved luminescence

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DO - 10.1021/acssensors.4c01892

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AN - SCOPUS:105003262240

SN - 2379-3694

JO - ACS Sensors

JF - ACS Sensors

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