Anthracene-based emitters for highly efficient deep blue organic light-emitting diodes with narrow emission spectrum

Liu, Futong; Cheng, Zhuang; Wan, Liang; Gao, Lei; Yan, Zhenyu; Hu, Dehua; Ying, Lei; Lü, Ping; Ma, Yuguang

doi:10.1016/j.cej.2021.131351

Cited by 68 publications

(44 citation statements)

References 51 publications

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“…With this in mind, many HLCT-based deep/ pure blue materials have been developed recently. [29][30][31][32][33][34][35][36][37][38][39][40][41][42] However, most of these emitters were utilized in OLED via vacuum deposition method. Very few exploration has been performed on the solution processable OLED based on deep/pure blue HLCT emitters.…”

Section: Introductionmentioning

confidence: 99%

Deep Blue Emitter Based on Tris(triazolo)triazine Moiety with CIE_y < 0.08 for Highly Efficient Solution‐Processed Organic Light‐Emitting Diodes Via Molecular Strategy of “Hot Excitons”

Zeng

Xiao

Zhou

et al. 2022

Adv Funct Materials

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Realizing high efficiency deep blue emission with a Commission international de I'Eclairage (CIE) coordinate of CIEy < 0.08 is still a big challenge. In this contribution, three molecules, named TTT‐TPA‐R (R = H, OMe, tBu), using tris(triazolo)triazine (TTT) as the acceptor and triphenylamine derivatives (TPA‐R, R = H, OMe, and tBu) as the donor are prepared and characterized. All these emitters show deep/pure blue emission between 420 and 470 nm in the PMMA film, concomitant with the excellent emission efficiency of 80–100%. Both experimental and calculated methods demonstrate that these emitters exhibit a clearly hybridized local and charge‐transfer excited state and can harvest both singlet and triplet excitons via reverse intersystem crossing process from the high‐lying triplet to singlet states. Therefore, the solution processable deep blue organic light‐emitting diodes (OLEDs) achieve a maximum external quantum efficiency (EQEmax) of 10.5% which is the recorded value for the solution processable deep blue OLED based on the “hot exciton” mechanism. Using TTT‐TPA‐H as the host material, solution‐processed phosphorescent OLED based on PO‐01 presents the EQEmax of 20.2%. These results pave a novel avenue for designing highly efficient deep blue emitter in solution processable OLED.

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Section: Introductionmentioning

confidence: 99%

Deep Blue Emitter Based on Tris(triazolo)triazine Moiety with CIE_y < 0.08 for Highly Efficient Solution‐Processed Organic Light‐Emitting Diodes Via Molecular Strategy of “Hot Excitons”

Zeng

Xiao

Zhou

et al. 2022

Adv Funct Materials

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“…The synthetic route for PIAnTPh 97 and PyIAnTPh 130 fluorophores is shown in Scheme 14. 144 The incorporation of the terphenyl group avoids the potential reduction of PLQY from strong CT characteristics. Particularly, the relatively weak CT state and the rigid structure can efficiently reduce the vibrational motion to obtain comparatively narrow emission spectra.…”

Section: Phenanthroimidazole-anthracene Based Hlct Characteristic Flu...mentioning

confidence: 99%

Recent progress in imidazole based efficient near ultraviolet/blue hybridized local charge transfer (HLCT) characteristic fluorophores for organic light-emitting diodes

Hong

Tagare

2022

J. Mater. Chem. C

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“…To trigger a rapid and efficient hRISC process, an ultra-small energy splitting ( ) and a relatively large spin–orbit coupling matrix element (SOCME) between the T n and S m states, and a sufficiently large energy gap between the T n and T 1 states ( ) are indispensible 3 , 5 , 6 . On the premise that the internal conversion (IC) process from the T n to T 1 states can be blocked thoroughly, and no T 1 excitons can be formed through direct electrical injection (i.e., ‘cold’ T 1 excitons), the theoretical maximum exciton utilization efficiency (EUE max ) of hRISC-OLED material is as high as 100% 3 , 7 – 9 . However, as most hRISC materials suffer from relatively small (< 2 eV 8 , 10 – 12 ), it is quite difficult to block the IC process of T n →T 1 completely.…”

Section: Introductionmentioning

confidence: 99%

Ultra-fast triplet-triplet-annihilation-mediated high-lying reverse intersystem crossing triggered by participation of nπ*-featured excited states

et al. 2022

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The harvesting of ‘hot’ triplet excitons through high-lying reverse intersystem crossing mechanism has emerged as a hot research issue in the field of organic light-emitting diodes. However, if high-lying reverse intersystem crossing materials lack the capability to convert ‘cold’ T1 excitons into singlet ones, the actual maximum exciton utilization efficiency would generally deviate from 100%. Herein, through comparative studies on two naphthalimide-based compounds CzNI and TPANI, we revealed that the ‘cold’ T1 excitons in high-lying reverse intersystem crossing materials can be utilized effectively through the triplet-triplet annihilation-mediated high-lying reverse intersystem crossing process if they possess certain triplet-triplet upconversion capability. Especially, quite effective triplet-triplet annihilation-mediated high-lying reverse intersystem crossing can be triggered by endowing the high-lying reverse intersystem crossing process with a 3ππ*→1nπ* character. By taking advantage of the permanent orthogonal orbital transition effect of 3ππ*→1nπ*, spin–orbit coupling matrix elements of ca. 10 cm−1 can be acquired, and hence ultra-fast mediated high-lying reverse intersystem crossing process with rate constant over 109 s−1 can be realized.

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Anthracene-based emitters for highly efficient deep blue organic light-emitting diodes with narrow emission spectrum

Cited by 68 publications

References 51 publications

Deep Blue Emitter Based on Tris(triazolo)triazine Moiety with CIE_y < 0.08 for Highly Efficient Solution‐Processed Organic Light‐Emitting Diodes Via Molecular Strategy of “Hot Excitons”

Deep Blue Emitter Based on Tris(triazolo)triazine Moiety with CIE_y < 0.08 for Highly Efficient Solution‐Processed Organic Light‐Emitting Diodes Via Molecular Strategy of “Hot Excitons”

Recent progress in imidazole based efficient near ultraviolet/blue hybridized local charge transfer (HLCT) characteristic fluorophores for organic light-emitting diodes

Ultra-fast triplet-triplet-annihilation-mediated high-lying reverse intersystem crossing triggered by participation of nπ*-featured excited states

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Anthracene-based emitters for highly efficient deep blue organic light-emitting diodes with narrow emission spectrum

Cited by 68 publications

References 51 publications

Deep Blue Emitter Based on Tris(triazolo)triazine Moiety with CIEy < 0.08 for Highly Efficient Solution‐Processed Organic Light‐Emitting Diodes Via Molecular Strategy of “Hot Excitons”

Deep Blue Emitter Based on Tris(triazolo)triazine Moiety with CIEy < 0.08 for Highly Efficient Solution‐Processed Organic Light‐Emitting Diodes Via Molecular Strategy of “Hot Excitons”

Recent progress in imidazole based efficient near ultraviolet/blue hybridized local charge transfer (HLCT) characteristic fluorophores for organic light-emitting diodes

Ultra-fast triplet-triplet-annihilation-mediated high-lying reverse intersystem crossing triggered by participation of nπ*-featured excited states

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Deep Blue Emitter Based on Tris(triazolo)triazine Moiety with CIE_y < 0.08 for Highly Efficient Solution‐Processed Organic Light‐Emitting Diodes Via Molecular Strategy of “Hot Excitons”

Deep Blue Emitter Based on Tris(triazolo)triazine Moiety with CIE_y < 0.08 for Highly Efficient Solution‐Processed Organic Light‐Emitting Diodes Via Molecular Strategy of “Hot Excitons”