多模发射的单层有机光学微腔

研究了有机发光材料在Ｆ－Ｐ微腔中的发光特性，有机光学微腔以多层介质膜和金属铝（Ａｌ）分别作为反射镜，８－羟基喹啉铝（Ａｌｑ）为发光材料，在微腔的光致光谱中观察到了多个模式以及明显的谱线窄化现象，发射光谱的主要特征和Ｆ－Ｐ微腔的谐振模式相同。

SINGLE-LAYER ORGANIC OPTICAL MICROCAVITYOF MULTY CAVITY MODES

The spontaneous emission properties of a single layer organic film in flat optical microcavity were studied. The optical microcavity was formed by a layer of a Tris(8-quino-linoloato) aluminum (Alq) film sandwiched between a quarter-wavelength distributedBragg reflector (DBR) and a Al metallic reflector. The DBR used here is a chirped one,the structure of which is GH1L1]6H1L1]6H1L1]6H2:2]6H3L3]4HThere the G label represents theglass substrate, the notation H1L1]6 implies a quarter-wave of high-index material H,followed by a quarter-wave of low-index material L, and 6 times. The high-index mate-rial is TiO2 with a refractive indices of 2. 0, the low-index material is SiO2 with a refractive indices of 1. 46. The Bragg wavelength of the three stacks is 430urn, 570urn and630urn, rspectively. The stopband range of the DBR was extended from 420nm to650nm.The PL spectrum of the microcavity and that of Alq film was compared at the sameexcitation condition. It showed that the PL spectrum of Alq film is a wider band, centered at 521urn with a FWHM of 93urn. The PL of the microcavity exhibits amultimodeemission that locates at blue, green and red spectral region. It showed that there are 4peaks in the PL spectrum of the microcavity. The three strong peaks are located at497urn, 555urn and 615urn, respectively. The other weaker peak is located at 449urn. Astrong spectral narrow from 100urn (full width half maximum)of film to 5.6nm of mi-crocavity in PL is observed. The results implied that using microcavity structure is auseful way to achieve multi-color emission.