Effect of Emitter Position on Emission Intensity in an Organic Planar Microcavity

We have fabricated a λ/2-length planar microcavity between two silver mirrors that had the same thickness and consisted of a sandwich structure LiF1/Alq3/LiF2.By altering the relative thickness of the two LiF layers,the adjustment of the position of thin layer Alq3 in the microcavity was achieved and the apparent photoluminescence (PL) intensity change was observed.The maximal emission intensity device,corresponding to the luminescence layer located at antinode,is four times that of the minimal one whose luminescence layer is near a silver mirror that is close to a node.This indicates that the coupling between vacuum electric field and dipole strongly affects the emission intensity in the forward direction of the microcavity plane.Comparing the PL intensity between the microcavity and the non-cavity devices with the same sandwith structure LiF1/Alq3/LiF2 in free space,at the resonance wavelength a maximal enhancement factor of nine is obtained.     

Three—Colour SIngle—Mode Electroluminescence from Alq3 Tuned by microcavities

Organic metal microcavities were fabricated by using full-reflectivity aluminium film and semi-transparent silver film as cavity mirrors.Unlike conventional organic microcavities,such as the typical structure of glass/DBR/ITO/-organic layers /metal mirror,a microcavity with a shorter cavity length was obtained by using two metal mirrors,where DBR is the distributed Bragg reflector consisting of alternate quarter-wave layers of high and low refractive index materials.It is realized that red,green and blue single-mode electroluminescence(EL) from the microcavities with the structure,glass/Ag/TPD/Alq3/Al,are electrically-driven when the thickness of the Alq3 layer changes,Compared to a non-cavity reference sample whose EL spectrum peak is located at 520nm with a full width at half maximum(FWHM)of 93nm,the microcavity devices show apparent cavity effects.The EL spectra of red,green and bule microcavities are peaked at 604nm,540nm and 491nm,with FWHM of 43nm,38nm and 47nm respectively.     

一种新型聚合物激光染料

报道了一种新型聚合物染料的受激发射特性     

有机薄膜在平面光学微腔中的光致发光特性

本文研究了有机薄膜在平面光学微腔中的光致发光特性。有机光学微脸以多层介质膜和金属银分别作为反射镜,８－羟基喹啉铝（Ａｌｑ）为发光层。Ａｌｑ薄膜的荧光峰位于５１９ｎｍ,谱线的半高全宽为９０ｎｍ。微腔的荧光峰位于５３０ｎｍ,谱线的半高全宽窄化至１０ｎｍ。谐振波长处的发射强度提高了一个数量级。     

Alq/DCM薄膜中的放大自发发射

自从在以 8-羟基喹啉铝 (Alq)掺杂小分子激光染料 DCM为激活介质的波导结构中 [1] ,光泵浦下观察到激光现象以来 ,这种以高效发光有机半导体材料代替以往的溶胶、凝胶或透明聚合物材料来稀释激光染料的方法 ,引起了人们广泛的关注和巨大的兴趣。因为 Alq的发射谱和 DCM的激发谱有很大的重叠 ,所以经光泵浦后的 Alq∶ DCM薄膜中处于激发态的 Alq分子很容易与附近的 DCM分子形成能量迁移[1] ,从而其发射谱表现为 DCM的荧光谱 ,而不是 Alq和 DCM的荧光谱的简单叠加。由于材料的发射谱相对于激发谱红移很大 ,所以很大程度上降低了材料…     

碟型量子阱微腔激光器的低阈值激射

利用反应离子刻蚀(RIE)和湿法腐蚀方法在InGaAs/InGaAsP多量子阱材料上研制出直径为8μm、4.5μm和2μm的碟型半导体微腔激光器。其中2μm直径的微碟在液氮温度下其光泵浦激射阈值仅为3μW左右。对高光功率密度下泵浦时出现的多模激射、跳模和激射光谱强度饱和现象进行了研究。并对微碟激光器的激射光谱线宽特性进行了初步的分析。