Low turn-on voltage and low roll-off rare earth europium complex-based organic light-emitting diodes with exciplex as the host,Journal of Materials Chemistry C

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Low turn-on voltage and low roll-off rare earth europium complex-based organic light-emitting diodes with exciplex as the host
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2017-11-07 00:00:00 , DOI: 10.1039/c7tc03694a
Bo Zhao _{1,

2,

3,

4,

5} , Heng Zhang _{1,

2,

3,

4,

5} , Yanqin Miao _{1,

2,

3,

4,

5} , Ziqi Wang _{1,

2,

3,

4,

5} , Long Gao _{1,

2,

3,

4,

5} , Hua Wang _{1,

2,

3,

4,

5} , Yuying Hao _{3,

4,

5,

6,

7} , Bingshe Xu _{1,

2,

3,

4,

5} , Wenlian Li _{5,

8,

9,

10}

Affiliation

Low turn-on voltage and low roll-off rare earth europium complex (Eu(DBM)₃Phen)-based organic light-emitting diodes (OLEDs) have been achieved by utilizing an exciplex of TCTA:Bphen as the host. At the optimal doping concentration of 10 wt%, the device shows pure and sharp emission of Eu³⁺ and the turn-on voltage, maximum current efficiency and external quantum efficiency (EQE) are 2.9 V, 3.85 cd A⁻¹ and 2.12%, respectively. More importantly, the roll-off ratio is just 12% from the maximum EQE to the EQE at 100 cd m⁻². Furthermore, by changing the exciplex host of TCTA:Bphen to the thermally activated delayed fluorescence (TADF) exciplex host of mCP:PO-T2T, the turn-on voltage was reduced further to 2.5 V and the maximum current efficiency, power efficiency and EQE reached 5.51 cd A⁻¹, 4.94 lm W⁻¹ and 3.11%, respectively. Barrier-free carrier injection, balanced carrier transport and recombination play key roles in this system. Moreover, the TADF mechanism also helps to improve the efficiency of the system, and more detailed discussions are given.

中文翻译：

以激基复合物为主体的低导通电压和低滚降稀土complex络合物基有机发光二极管

通过使用TCTA：Bphen的激基复合物实现了低导通电压和低滚降稀土euro络合物（Eu（DBM）₃ Phen）基有机发光二极管（OLED）。在10 wt％的最佳掺杂浓度下，该器件显示出Eu ^3+的纯净清晰发射，并且开启电压，最大电流效率和外部量子效率（EQE）为2.9 V，3.85 cd A ^-1和2.12％，分别。更重要的是，从最大EQE到100 cd m ^-2的EQE的滚降率仅为12％。此外，通过将TCTA：Bphen的激基复合物宿主更改为mCP：PO-T2T的热激活延迟荧光（TADF）激基复合物宿主，开启电压进一步降低至2.5 V，最大电流效率，功率效率和EQE达到5.51光盘^-1，4.94流明w ^ ^-1分别和3.11％。无障碍载流子注入，平衡的载流子传输和重组在该系统中起着关键作用。此外，TADF机制还有助于提高系统效率，并给出了更详细的讨论。

更新日期：2017-11-20

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