Organic light emitting devices (OLEDs), especially in a screen display format, present unique and interesting substrates for laser desorption/ionization-mass spectrometry imaging (LDI-MSI) analysis. These devices contain many compounds that inherently absorb light energy and do not require an additional matrix to induce desorption and ionization. OLED screens have lateral features with dimensions that are tens of microns in magnitude and depth features that are tens to hundreds of nanometers thick. Monitoring the chemical composition of these features is essential, as contamination and degradation can impact device lifetime. This work demonstrates the capability of LDI-MSI to obtain lateral and partial depth resolved information on multicolored OLED displays and suggests the application to other mixed organic electronics with minimal sample preparation. This was realized when analyzing two different manufactured OLEDs, in an active-matrix display format, without the need to remove the cathode. By utilizing low laser energy and high lateral spatial resolution imaging (10 μm), depth profiling can be observed while maintaining laterally resolved information, resulting in a three-dimensional MSI approach that would complement existing OLED characterization methods.

中文翻译：

---

激光解吸电离质谱成像对OLED进行三维剖析。

有机发光器件（OLED），特别是以屏幕显示形式，为激光解吸/电离质谱成像（LDI-MSI）分析提供了独特而有趣的基板。这些设备包含许多固有吸收光能的化合物，不需要额外的基质即可引发解吸和电离。OLED屏幕具有横向特征，尺寸为数十微米，深度特征为数十至数百纳米。监视这些功能部件的化学成分至关重要，因为污染和降解会影响设备寿命。这项工作证明了LDI-MSI在彩色OLED显示器上获得横向和局部深度分辨信息的能力，并建议以最少的样品制备将其应用于其他混合有机电子产品。当以有源矩阵显示格式分析两种不同的制成的OLED而无需去除阴极时，就可以实现这一点。通过利用低激光能量和高横向空间分辨率成像（10μm），可以在保持横向解析信息的同时观察深度剖析，从而形成了一种三维MSI方法，可以补充现有的OLED表征方法。