A phosphorescence study of jet-cooled xanthone

Baba, Masaaki; Kamei, Toshihiro; Kiritani, Masahide; Yamauchi, Seigo; Hirota, Noboru

doi:10.1016/s0009-2614(91)85074-7

“…S 0 transition [29,30] (8.64 eV) [32] and 68 718 cm À1 (8.52 eV) [35] ] even if the ionisation originates from the T 1 state (25 808 cm À1 ). [29,30] No ion signal was obtained in the R2PI spectrum of the S 1 ! S 0 transition, furthermore direct excitation to the T 1 state (25 808 cm À1 ) [29,30] was not successful.…”

Section: Resultsmentioning

confidence: 99%

“…[29,30] No ion signal was obtained in the R2PI spectrum of the S 1 ! S 0 transition, furthermore direct excitation to the T 1 state (25 808 cm À1 ) [29,30] was not successful. The S 2 !…”

Section: Resultsmentioning

confidence: 99%

“…These values are in excellent agreement with the experimentally observed transitions at 26 939 cm À1 (S 1 ! S 0 ), [29,30] 30 729 cm À1 (S 2 ! S 0 ) and 25 808 cm À1 (T 1 !…”

Section: Theoretical Methodsmentioning

confidence: 99%

“…S 0 ) [see Section 3]. [29,30] The pp* excitation into the S 2 state can mainly be described as an excitation from a p-type orbital located at the inner ring into an unoccupied p-type orbital at the outer rings, leading to an elongation of the C=O bond from 1.223 to 1.247 . The adjacent CÀC bonds (C 7 ÀC 8 and C 7' ÀC 8 cf.…”

Section: Theoretical Methodsmentioning

confidence: 99%

“…In a supersonic jet the T 1 state (np*) has been characterised via phosphorescence spectroscopy. [29,30] The origin of the S 1 state (np*) was determined to be at 26 939 cm À1 , the one of the S 2 state (pp*) is at 30 718 cm À1 and the origin of the T 1 state is at 25 808 cm…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Structure of Isolated Xanthone in the T₁ State Obtained via Combined UV/IR Spectroscopy

Bartl

¹

,

Функ

²

,

Gerhards

³

2009

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In order to extend combined UV/IR spectroscopy to triplet states, xanthone has been chosen as a model system due to its efficient intersystem crossing (ISC). The IR/R2PI (resonant two-photon ionisation) spectrum of the electronic ground state (S(0)) as well as the IR spectrum of the T(1) state have been recorded in a supersonic jet. We show that the IR spectrum of a triplet state can be recorded subsequent to an ISC. In combination with DFT and TDDFT calculations, structural assignments are performed and geometrical changes are identified.

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Purely Organic Room‐Temperature Phosphorescence Molecule for High‐Performance Non‐Doped Organic Light‐Emitting Diodes

Peng,

Zou,

Zeng

et al. 2024

Angewandte Chemie

0

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Purely organic molecules with room‐temperature phosphorescence (RTP) are potential luminescent materials with high exciton utilization for organic light‐emitting diodes (OLEDs), but those exhibiting superb electroluminescence (EL) performances are rarely explored, mainly due to their long phosphorescence lifetimes. Herein, a robust purely organic RTP molecule, 3,6‐bis(5‐phenylindolo[3,2‐a]carbazol‐12(5H)‐yl)‐xanthen‐9‐one (3,2‐PIC‐XT), is developed. The neat film of 3,2‐PIC‐XT shows strong green RTP with a very short lifetime (2.9 μs) and a high photoluminescence quantum yield (72%), and behaviors balanced bipolar charge transport. The RTP nature of 3,2‐PIC‐XT is validated by steady‐state and transient absorption and emission spectroscopies, and the working mechanism is deciphered by theoretical simulation. Non‐doped multilayer OLEDs using thin neat films of 3,2‐PIC‐XT furnish an outstanding external quantum efficiency (EQE) of 24.91% with an extremely low roll‐off (1.6%) at 1000 cd m‒2. High‐performance non‐doped top‐emitting and tandem OLEDs are also achieved, providing remarkable EQEs of 24.53% and 42.50%, respectively. Delightfully, non‐doped simplified OLEDs employing thick neat films of 3,2‐PIC‐XT are also realized, furnishing an excellent EQE of 17.79% and greatly enhanced operational lifetime. The temperature‐dependent and transient EL spectroscopies demonstrate the electrophosphorescence attribute of 3,2‐PIC‐XT. These non‐doped OLEDs are the best devices based on purely organic RTP materials reported so far.

show abstract

Purely Organic Room‐Temperature Phosphorescence Molecule for High‐Performance Non‐Doped Organic Light‐Emitting Diodes

Peng,

Zou,

Zeng

et al. 2024

Angew Chem Int Ed

4

0

View full text Add to dashboard Cite

Purely organic molecules with room‐temperature phosphorescence (RTP) are potential luminescent materials with high exciton utilization for organic light‐emitting diodes (OLEDs), but those exhibiting superb electroluminescence (EL) performances are rarely explored, mainly due to their long phosphorescence lifetimes. Herein, a robust purely organic RTP molecule, 3,6‐bis(5‐phenylindolo[3,2‐a]carbazol‐12(5H)‐yl)‐xanthen‐9‐one (3,2‐PIC‐XT), is developed. The neat film of 3,2‐PIC‐XT shows strong green RTP with a very short lifetime (2.9 μs) and a high photoluminescence quantum yield (72%), and behaviors balanced bipolar charge transport. The RTP nature of 3,2‐PIC‐XT is validated by steady‐state and transient absorption and emission spectroscopies, and the working mechanism is deciphered by theoretical simulation. Non‐doped multilayer OLEDs using thin neat films of 3,2‐PIC‐XT furnish an outstanding external quantum efficiency (EQE) of 24.91% with an extremely low roll‐off (1.6%) at 1000 cd m‒2. High‐performance non‐doped top‐emitting and tandem OLEDs are also achieved, providing remarkable EQEs of 24.53% and 42.50%, respectively. Delightfully, non‐doped simplified OLEDs employing thick neat films of 3,2‐PIC‐XT are also realized, furnishing an excellent EQE of 17.79% and greatly enhanced operational lifetime. The temperature‐dependent and transient EL spectroscopies demonstrate the electrophosphorescence attribute of 3,2‐PIC‐XT. These non‐doped OLEDs are the best devices based on purely organic RTP materials reported so far.

show abstract

A phosphorescence study of jet-cooled xanthone

Cited by 20 publications

References 18 publications

Structure of Isolated Xanthone in the T₁ State Obtained via Combined UV/IR Spectroscopy

Structure of Isolated Xanthone in the T₁ State Obtained via Combined UV/IR Spectroscopy

Purely Organic Room‐Temperature Phosphorescence Molecule for High‐Performance Non‐Doped Organic Light‐Emitting Diodes

Purely Organic Room‐Temperature Phosphorescence Molecule for High‐Performance Non‐Doped Organic Light‐Emitting Diodes

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A phosphorescence study of jet-cooled xanthone

Cited by 20 publications

References 18 publications

Structure of Isolated Xanthone in the T1 State Obtained via Combined UV/IR Spectroscopy

Structure of Isolated Xanthone in the T1 State Obtained via Combined UV/IR Spectroscopy

Purely Organic Room‐Temperature Phosphorescence Molecule for High‐Performance Non‐Doped Organic Light‐Emitting Diodes

Purely Organic Room‐Temperature Phosphorescence Molecule for High‐Performance Non‐Doped Organic Light‐Emitting Diodes

Contact Info

Product

Resources

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Structure of Isolated Xanthone in the T₁ State Obtained via Combined UV/IR Spectroscopy

Structure of Isolated Xanthone in the T₁ State Obtained via Combined UV/IR Spectroscopy