TY - JOUR
T1 - Electronic Spectra of Cs2NaYb(NO2)6
T2 - Is There Quantum Cutting?
AU - Luo, Yuxia
AU - Liu, Zhenyu
AU - HAU, Sam C K
AU - Yeung, Yau Yuen
AU - WONG, Ka-Leung
AU - SHIU, Kwok Keung
AU - Chen, Xueyuan
AU - Zhu, Haomiao
AU - Bao, Guochen
AU - Tanner, Peter A.
N1 - Funding Information:
Z.L. acknowledges support by the Natural Science Foundation of China (Grant No. 21701136). Y.Y.Y. acknowledges internal funding from the Education University of Hong Kong. X.C. acknowledges partial support by the CAS/SAFEA International Partnership Program for Creative Research Teams.
PY - 2018/5/3
Y1 - 2018/5/3
N2 - The crystal structure and electronic spectra of the Th symmetry hexanitritoytterbate(III) anion have been studied in Cs2NaY0.96Yb0.04(NO2)6, which crystallizes in the cubic space group Fm3. The emission from Yb3+ can be excited via the NO2- antenna. The latter electronic transition is situated at more than twice the energy of the former, but at room temperature, one photon absorbed at 470 nm in the triplet state produces no more than one photon emitted. Some degree of quantum cutting is observed at 298 K under 420 nm excitation into the singlet state and at 25 K using excitation into either state. The quantum efficiency is ∼10% at 25 K. The energy level scheme of Yb3+ has been deduced from excitation and emission spectra and calculated by crystal field theory. New improved energy level calculations are also reported for the Cs2NaLn(NO2)6 (Ln = Pr, Eu, Tb) series using the f-Spectra package. The neat crystal Cs2NaYb(NO2)6 has also been studied, but results were unsatisfactory due to sample decomposition, and this chemical instability makes it unsuitable for applications.
AB - The crystal structure and electronic spectra of the Th symmetry hexanitritoytterbate(III) anion have been studied in Cs2NaY0.96Yb0.04(NO2)6, which crystallizes in the cubic space group Fm3. The emission from Yb3+ can be excited via the NO2- antenna. The latter electronic transition is situated at more than twice the energy of the former, but at room temperature, one photon absorbed at 470 nm in the triplet state produces no more than one photon emitted. Some degree of quantum cutting is observed at 298 K under 420 nm excitation into the singlet state and at 25 K using excitation into either state. The quantum efficiency is ∼10% at 25 K. The energy level scheme of Yb3+ has been deduced from excitation and emission spectra and calculated by crystal field theory. New improved energy level calculations are also reported for the Cs2NaLn(NO2)6 (Ln = Pr, Eu, Tb) series using the f-Spectra package. The neat crystal Cs2NaYb(NO2)6 has also been studied, but results were unsatisfactory due to sample decomposition, and this chemical instability makes it unsuitable for applications.
UR - http://www.scopus.com/inward/record.url?scp=85046685836&partnerID=8YFLogxK
U2 - 10.1021/acs.jpca.8b01915
DO - 10.1021/acs.jpca.8b01915
M3 - Article
C2 - 29641197
AN - SCOPUS:85046685836
SN - 1089-5639
VL - 122
SP - 4381
EP - 4388
JO - Journal of Physical Chemistry A
JF - Journal of Physical Chemistry A
IS - 17
ER -