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Precise modulation of multiple resonance emitters toward efficient electroluminescence with pure-red gamut for high-definition displays.

ABSTRACT: Multiple resonance (MR) compounds have garnered substantial attention for their prospective utility in wide color gamut displays. Nevertheless, developing red MR emitters with both high efficiency and saturated emission color remains demanding. We herein introduce a comprehensive strategy for spectral tuning in the red region by simultaneously regulating the π-conjugation and electron-donating strengths of a double boron-embedded MR skeleton while preserving narrowband characteristics. The proof-of-concept materials manifested emissions from orange-red to deep red, with bandwidths below 0.12 eV. The pure-red device based on CzIDBNO displayed superior color purity with CIE coordinates of (0.701, 0.298), approaching the Broadcast Television 2020 standard. In concert with high photoluminescence quantum yield and strong horizontal dipole orientation, CzIDBNO also achieved a maximum external quantum efficiency of 32.5% and a current efficiency of 20.2 cd A^-1, outstripping prior reported organic light-emitting diodes (OLEDs) with CIE_x exceeding 0.68. These findings offer a roadmap for designing high-performance emitters with exceptional color purity for future OLED material research advancements.

SUBMITTER: Jing YY

PROVIDER: S-EPMC10381944 | biostudies-literature | 2023 Jul

REPOSITORIES: biostudies-literature

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Precise modulation of multiple resonance emitters toward efficient electroluminescence with pure-red gamut for high-definition displays.

Jing Yan-Yun YY Li Nengquan N Cao Xiaosong X Wu Han H Miao Jingsheng J Chen Zhanxiang Z Huang Manli M Wang Xinzhong X Hu Yuxuan Y Zou Yang Y Yang Chuluo C

Science advances 20230728 30

Multiple resonance (MR) compounds have garnered substantial attention for their prospective utility in wide color gamut displays. Nevertheless, developing red MR emitters with both high efficiency and saturated emission color remains demanding. We herein introduce a comprehensive strategy for spectral tuning in the red region by simultaneously regulating the π-conjugation and electron-donating strengths of a double boron-embedded MR skeleton while preserving narrowband characteristics. The proof ...[more]

PMID: 37506207

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Project description:Multi-resonance thermally activated delayed fluorescence (MR-TADF) materials of polycyclic heteroaromatics are attractive narrowband emitters in wide-color-gamut organic light-emitting diodes (OLEDs). However, deep-blue MR-TADF emitters with CIE coordinates fulfilling the BT.2020 standard and high efficiency still remain a significant challenge. Herein, two novel emitters NBO-mSAF and NBO-pSAF were developed by incorporating an electron donor, 10H-spiro[acridine-9,9'-fluorene] (SAF), at the para-position of the oxygen atom and the para-position of the boron atom in the nitrogen/boron/oxygen (N/B/O) ternary doped asymmetric MR skeleton. With appropriate electron-donating capacity and rigid spiro-structure, SAF was selected as the donor so that the long-range charge transfer triplet state (3LRCT) is induced to accelerate the reverse intersystem crossing (RISC) process, while the 1LRCT aligns higher than the short-range CT state (1SRCT) of the N/B/O core to retain the MR characters. As a result, these optimized emitters exhibit deep-blue TADF with narrow spectra and a high RISC rate constant of 3.4 × 105 s-1. In hyperfluorescence OLEDs with a TADF emitter DMAC-DPS as the sensitizer and PPF as the host, NBO-mSAF and NBO-pSAF achieved maximum external quantum efficiencies (EQEmax) of 26.7% and 25.2%. Interestingly, improved performance was realized in a traditional device configuration with a single bipolar host 26DCzPPy but without any sensitizer, where NBO-mSAF realized a higher EQEmax of 29.5% and CIE (0.128, 0.114), and NBO-pSAF exhibited an EQEmax of 20.5% and CIE of (0.147, 0.048). Narrow full width at half maximum (FWHM) values of 26-28 nm were achieved in both devices. Among all the deep-blue N/B/O type MR-TADF emitters with CIEx ≤ 0.15 and CIEy ≤ 0.12 ever reported so far, NBO-mSAF exhibited a highest EQEmax of 29.5%, which is even higher than those obtained with sensitizers, while the CIEy = 0.048 of the NBO-pSAF device is close to the standard blue (0.046) according to BT.2020, with a decent EQE of 20%.

Dataset Information

Precise modulation of multiple resonance emitters toward efficient electroluminescence with pure-red gamut for high-definition displays.

Publications

Precise modulation of multiple resonance emitters toward efficient electroluminescence with pure-red gamut for high-definition displays.

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