Synthesis and Electroluminescence Properties of Delayed Fluorescence Materials Based on Dibenzopyridoquinoxaline

Yaozu Yang; Feixiang Huang; Fengming Xie; Qiang Zhang; Guo Yuan; Yingyuan Hu; Xin Zhao

doi:10.3788/AOS231985

Acta Optica Sinica, Volume. 44, Issue 8, 0816001(2024)

Synthesis and Electroluminescence Properties of Delayed Fluorescence Materials Based on Dibenzopyridoquinoxaline

Yaozu Yang¹, Feixiang Huang¹, Fengming Xie², Qiang Zhang¹, Guo Yuan¹, Yingyuan Hu^1、**, and Xin Zhao^1、*

Author Affiliations

¹School of Chemistry and Life Sciences, Suzhou University of Science and Technology, Suzhou 215009, Jiangsu , China

²Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, Suzhou 215123, Jiangsu , China

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Figures & Tables(9)

Fig. 1. Synthetic routes of BPQTPA and BPQPXZ

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Fig. 2. FMOs, energy levels, and E_g of BPQTPA and BPQPXZ, respectively

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Fig. 3. Normalized UV-vis absorption at room temperature and fluorescence spectra and phosphorescence spectra at 77 K of BPQTPA and BPQPXZ, respectively. (a) BPQTPA; (b) BPQPXZ

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Fig. 4. Transient fluorescence decay curves of BPQTPA and BPQPXZ in doped mCBP films

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Fig. 5. Cyclic voltammetry curves of BPQTPA and BPQPXZ

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Fig. 6. Thermogravimetric analysis curves of BPQTPA and BPQPXZ

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Fig. 7. Energy level structure and performance of OLED devices. (a) Energy level structure; (b) current density-voltage-luminance characteristic curves; (c) EQE versus luminance curves; (d) CIE coordinates; (e) EL spectra; (f) CE versus luminance curves and PE versus luminance curves

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Table 1. Summary of photophysical, electrochemical, and thermal properties of two compounds

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Table 1. Summary of photophysical, electrochemical, and thermal properties of two compounds

Compound	λ_abs^a） /nm	λ_FL^a） /nm	λ_Ph^a） /nm	E_HOMO^b） /eV	E_LUMO^c） /eV	E_g^d） /eV	T_d^e） /℃	PLQY^f） /%	ΔE_ST^g） /eV
BPQPXZ	302， 314， 379， 396， 519	655	681	-5.25	-3.27	1.98	439.2	22.3	0.07
BPQTPA	329， 388， 457	585	619	-5.38	-3.00	2.38	492.6	82.7	0.12

Table 2. Comparison of device performance of two compounds
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Table 2. Comparison of device performance of two compounds
Compound λ_EL^e） /nm V_on^a） /V EQE^b） /% PE^c） /（lm·W^-1） CE^d） /（cd·A^-1） CIE^f) (x, y)
BPQPXZ 660 3.5 1.0 0.5 0.5 (0.65, 0.34)
BPQTPA 555 2.8 7.0 18.5 16.5 (0.45, 0.50)

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Yaozu Yang, Feixiang Huang, Fengming Xie, Qiang Zhang, Guo Yuan, Yingyuan Hu, Xin Zhao. Synthesis and Electroluminescence Properties of Delayed Fluorescence Materials Based on Dibenzopyridoquinoxaline[J]. Acta Optica Sinica, 2024, 44(8): 0816001

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