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Highly Efficient Deep Blue Fluorescent Organic Light-Emitting Diodes Boosted by Thermally Activated Delayed Fluorescence Sensitization
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2018-03-02 00:00:00 , DOI: 10.1021/acsami.7b19030 Dae Hyun Ahn 1 , Jae Ho Jeong 2 , Jie Song 2 , Ju Young Lee 1 , Jang Hyuk Kwon 1
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2018-03-02 00:00:00 , DOI: 10.1021/acsami.7b19030 Dae Hyun Ahn 1 , Jae Ho Jeong 2 , Jie Song 2 , Ju Young Lee 1 , Jang Hyuk Kwon 1
Affiliation
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Highly efficient deep blue fluorescent material and various thermally activated delayed fluorescent (TADF) blue sensitization materials were synthesized for fluorescent deep blue organic light-emitting diodes (OLEDs). These materials were designed and selected by considering efficient energy transfer conditions (i.e., spectral overlap and quantum efficiency) between sensitizer and acceptor. Energy transfer process from TADF host sensitizers to deep blue fluorescent emitter has been investigated by measuring the energy transfer rate. Measured energy transfer rate was to be 1.24 × 1010 s–1 (mol/dm3)−1 for a prompt decay of fluorescence and 2.61 × 108 s–1 (mol/dm3)−1 for delayed fluorescence, which demonstrated the efficient energy transfer. Indeed, highly efficient deep blue fluorescent OLEDs boosted by the TADF host-sensitization process were successfully fabricated. The maximum external quantum efficiency was 19.0% with color coordinates of (0.14, 0.15) and 15.5% with color coordinates of (0.15, 0.11) in the different host system. The efficiency roll-off characteristic and device operating lifetime were also improved by this efficient sensitization process.
中文翻译：
通过热激活延迟荧光敏化增强的高效深蓝色荧光有机发光二极管
合成了高效的深蓝色荧光材料和各种热激活延迟荧光（TADF）蓝色敏化材料，用于荧光深蓝色有机发光二极管（OLED）。通过考虑敏化剂和受体之间的有效能量转移条件（即光谱重叠和量子效率）来设计和选择这些材料。通过测量能量转移速率，研究了从TADF基质敏化剂到深蓝色荧光发射体的能量转移过程。测得的能量传递速率为1.24×10 10 s –1（mol / dm 3）-1，以迅速衰减荧光，而为2.61×10 8 s –1（mol / dm 3））-1用于延迟荧光，这证明了有效的能量转移。实际上，已经成功地制造了通过TADF主体敏化工艺增强的高效深蓝色荧光OLED。在不同的宿主系统中，色坐标为（0.14，0.15）的最大外部量子效率为19.0％，色坐标为（0.15，0.11）的最大外部量子效率为15.5％。通过这种有效的敏化过程，还可以提高效率的滚降特性和器件的使用寿命。
更新日期：2018-03-02
中文翻译：
通过热激活延迟荧光敏化增强的高效深蓝色荧光有机发光二极管
合成了高效的深蓝色荧光材料和各种热激活延迟荧光（TADF）蓝色敏化材料，用于荧光深蓝色有机发光二极管（OLED）。通过考虑敏化剂和受体之间的有效能量转移条件（即光谱重叠和量子效率）来设计和选择这些材料。通过测量能量转移速率，研究了从TADF基质敏化剂到深蓝色荧光发射体的能量转移过程。测得的能量传递速率为1.24×10 10 s –1（mol / dm 3）-1，以迅速衰减荧光，而为2.61×10 8 s –1（mol / dm 3））-1用于延迟荧光，这证明了有效的能量转移。实际上，已经成功地制造了通过TADF主体敏化工艺增强的高效深蓝色荧光OLED。在不同的宿主系统中，色坐标为（0.14，0.15）的最大外部量子效率为19.0％，色坐标为（0.15，0.11）的最大外部量子效率为15.5％。通过这种有效的敏化过程，还可以提高效率的滚降特性和器件的使用寿命。
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