Low-Threshold Distributed-Feedback Lasers Based on Pyrene-Cored Starburst Molecules with 1,3,6,8-Attached Oligo(9,9-Dialkylfluorene) Arms
Low-Threshold Distributed-Feedback Lasers Based on Pyrene-Cored Starburst Molecules with 1,3,6,8-Attached Oligo(9,9-Dialkylfluorene) Arms
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DOI：
10.1002/adfm.200900503
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发表时间：
2009-09-09
影响因子：
19
通讯作者：
Bradley, Donal D. C.
中科院分区：
文献类型：
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作者：
Xia, Ruidong;Lai, Wen-Yong;Bradley, Donal D. C.
在这里，报道了天蓝色发光芘核 9,9-二烷基芴星暴的光学增益特性的详细表征；结果表明，这些材料具有令人鼓舞的低激光阈值和相对较高的热稳定性和环境稳定性。该材料表现出高固态光致发光 (PL) 量子效率 (>90%) 和接近单指数的 PL 衰变瞬态，激发态寿命约为 1.4 ns。薄膜板波导放大自发发射(ASE)测量的净增益达到75-78 cm(-1)。研究发现，ASE 阈值能量不受加热至 130 摄氏度（比 T-g 高 40 至 50 摄氏度）的影响。在高达 170 或 200 摄氏度的退火温度下，ASE 仍然可观察到。具有 75% 填充因子和 320 nm 周期的 ID 分布式反馈激光器显示出低至 38-65 Wcm(-2) 的光泵浦阈值、高达 3.9% 的激光斜率效率以及在 471-512 nm 附近类似于 40 nm 的波长调谐范围。此外，这些激光器具有相对较长的工作寿命，对于在空气中以十倍阈值工作的未封装器件，N-1/2 >= 1.1 X 10(5) 脉冲。
Here, a detailed characterization of the optical gain properties of sky-blue-light-emitting pyrene-cored 9,9-dialkylfluorene starbursts is reported; it is shown that these materials possess encouragingly low laser thresholds and relatively high thermal and environmental stability. The materials exhibit high solid-state photoluminescence (PL) quantum efficiencies (>90%) and near-single-exponential PL decay transients with excited state lifetimes of similar to 1.4 ns. The thin-film slab waveguide amplified spontaneous emission (ASE)-measured net gain reaches 75-78 cm(-1). The ASE threshold energy is found to remain unaffected by heating at temperatures up to 130 degrees C, 40 to 50 degrees C above T-g. The ASE remained observable for annealing temperatures up to 170 or 200 degrees C. I D distributed feedback lasers with 75% fill factor and 320 nm period show optical pumping thresholds down to 38-65 Wcm(-2), laser slope efficiencies up to 3.9%, and wavelength tuning ranges of similar to 40 nm around 471-512 nm. In addition, these lasers have relatively long operational lifetimes, with N-1/2 >= 1.1 X 10(5) pulses for unencapsulated devices operated at ten times threshold in air.