Accurate Efficiency Measurements of Organic Light-Emitting Diodes via Angle-Resolved Spectroscopy
Accurate Efficiency Measurements of Organic Light-Emitting Diodes via Angle-Resolved Spectroscopy
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DOI：
10.1002/adom.202000838
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发表时间：
2020-11-08
影响因子：
9
通讯作者：
Gather, Malte C.
中科院分区：
文献类型：
--
作者：
Archer, Emily;Hillebrandt, Sabina;Gather, Malte C.
薄膜发光二极管（LED）（包括有机发光二极管（OLED）、钙钛矿LED和量子点LED）的准确表征对于理解影响其效率的因素至关重要，因此对于制造具有更高性能和稳定性的LED至关重要。此外，关于LED发射的角度特性的详细信息对于评估各个架构的适用性是有用的，例如，用于显示应用。在此，描述了基于角度计的测量系统和相应协议的实现，其允许准确地确定OLED和其他新兴薄膜LED的电流-电压-亮度特性、外部量子效率和发光效率。该系统允许记录角分辨电致发光光谱和精确的效率测量与朗伯和非朗伯发射特性的设备。提供了用于组装和对准所需硬件的设置和协议的详细描述。包括所有定制部件的图纸以及执行测量和分析数据所需的开源Python软件。
The accurate characterization of thin-film light emitting diodes (LEDs)-including organic light emitting diodes (OLEDs), perovskite LEDs, and quantum dot LEDs-is crucial to the understanding of the factors that influence their efficiency and thus to the fabrication of LEDs with improved performance and stability. In addition, detailed information about the angular characteristics of LED emission is useful to assess the suitability of individual architectures, e.g., for display applications. Here, the implementation of a goniometer-based measurement system and corresponding protocol are described that allow to accurately determine the current-voltage-luminance characteristics, external quantum efficiency, and luminous efficacy of OLEDs and other emerging thin-film LEDs. The system allows recording of angle-resolved electroluminescence spectra and accurate efficiency measurements for devices with both Lambertian and non-Lambertian emission characteristics. A detailed description of the setup and a protocol for assembling and aligning the required hardware are provided. Drawings of all custom parts and the open-source Python software required to perform the measurement and to analyze the data are included.