Improvement of the luminescence in p-type as-prepared or dye impregnated porous silicon microcavities

Setzu, S.; Létant, Sonia E.; Solsona, P.; Romestain, R.; Vial, Jean-Claude

doi:10.1016/s0022-2313(98)00081-7

Cited by 56 publications

(39 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Early efforts to prepare a silicon-based laser by incorporating emissive dyes such as rhodamine into a microcavity structure fabricated from porous Si encountered this problem. [182] The solution was to oxidize the porous Si matrix before dye infusion, separating the dye molecule from the solid state quencher with an insulating oxide layer, which resulted in a light-pumped micro dye laser. [183] Such an approach can also be harnessed to prepare sensors with interesting biochemical responses.…”

Section: Molecular Photoluminescence Quenched By Porous Si Particlesmentioning

confidence: 99%

Photoluminescence‐Based Sensing With Porous Silicon Films, Microparticles, and Nanoparticles

Sailor

2009

Adv Funct Materials

150

107

View full text Add to dashboard Cite

Here, chemical sensors made from porous Si are reviewed, with an emphasis on systems that harness photoluminescence and related energy‐ and charge‐transfer mechanisms available to porous Si‐derived nanocrystallites. Quenching of luminescence by molecular adsorbates involves the harvesting of energy from a delocalized nanostructure that can be much larger than the molecule being sensed, providing a means to amplify the sensory event. The interaction of chemical species on the surface of porous Si can exert a pronounced influence on this process, and examples of some of the key chemical reactions that modify either the surface or the bulk properties of porous Si are presented. Sensors based on micron‐scale and smaller porous Si particles are also discussed. Miniaturization to this size regime enables new applications, including imaging of cancerous tissues, indirect detection of reactive oxygen species (ROS), and controlled drug release. Examples of environmental and in vivo sensing systems enabled by porous Si are provided.

show abstract

Section: Molecular Photoluminescence Quenched By Porous Si Particlesmentioning

confidence: 99%

Photoluminescence‐Based Sensing With Porous Silicon Films, Microparticles, and Nanoparticles

Sailor

2009

Adv Funct Materials

150

107

View full text Add to dashboard Cite

show abstract

“…Bubbles form and stick on the Si surface in pure aqueous solutions, whereas they are promptly removed if ethanol (or some other surfactant) is present. Moreover, it has been found that lateral inhomogeneity and surface roughness can be reduced (increasing electrolyte viscosity) either by dimin-ishing the temperature or introducing glycerol to the composition of the HF solution [12].…”

Section: Parameters Which Affect the Ps Formationmentioning

confidence: 99%

Porous Silicon

Ossicini¹,

Pavesi²,

Priolo³

2003

Springer Tracts in Modern Physics

View full text Add to dashboard Cite

In 1990 it was proposed that Si when rendered porous can be an efficient light emitting system, as efficient as many III-V semiconductor systems [1]. The reason for this was attributed to the low dimensionality of the surviving Si skeleton. In addition other effects were recognized: (1) the large photon extraction efficiency due to the decrease in the effective refractive index and (2) the confinement of the carriers in regions free of recombination centers. After this very surprising report, a huge number of papers was published trying to understand the optical properties of porous silicon (PS) and the physical mechanism at the heart of the large luminescence efficiency. Soon it was realized that PS is a very fragile and highly reactive material so that many of its properties are age dependent and unstable. Over the years, sizeable progress was made both in terms of improvement of its stability and in term of efficiency of the device. Microelectronics compatibility of PS was demonstrated and integration of driving circuits with a light emitting element was performed [2]. At the same time microcavities with improved light emission properties were demonstrated [3]. At the end of 2000 another paper shocked the silicon community: the report on light amplification or optical gain in silicon nanocrystals [4]. This paper raises big hopes of the development of a silicon laser even though it is not yet clear whether PS can be used as an active material.In this chapter we will try to review the most important results about the exploitation and the understanding of the properties of PS. The chapter is divided into six parts. The first introduces how porous silicon is made. The second is aimed to demonstrate that the structure of PS is a collection of nanometric objects that contribute to the light emission process. The relevant role of the surface chemistry is underlined. The third and fourth parts discuss the essential features of the absorption and luminescence of PS in order to discriminate between the models of the recombination mechanisms. The fifth presents recent progress in the field of electrical properties of PS. The section six is an overview of the application of PS in light emitting diodes.In the last few years various conference proceedings [5], review articles [6] and edited books [7] have been published on PS.

show abstract

“…In addition, the quality of the SiO 2 that is formed after a thermal oxidation makes the material a very appealing porous host for the impregnation of different substances. Previous works report dye impregnation of this material [5][6][7][8][9]. However, laser action has not still been demonstrated.…”

Section: Introductionmentioning

confidence: 98%

Optical gain in oxidized porous silicon waveguides impregnated with a laser dye

Otón

Navarro-Urriós

Ghulinyan

et al. 2007

Phys. Status Solidi (c)

View full text Add to dashboard Cite

We report positive optical gain under pulsed excitation in oxidized porous silicon planar waveguides impregnated with Nile Blue (LC 6900). Guided photoluminescence measurements show a dramatic line narrowing and a strong superlinear behaviour of the red emission when the pump power is increased. Variable stripe length (VSL) measurements show a clear transition from losses to gain, with a threshold of ∼3 mJ/cm2 at 700 nm. A maximum gain coefficient of 8.7 cm-1 is reported. © 2007 WILEY-VCH Verlag GmbH & Co. KGaA

show abstract

Improvement of the luminescence in p-type as-prepared or dye impregnated porous silicon microcavities

Cited by 56 publications

References 11 publications

Photoluminescence‐Based Sensing With Porous Silicon Films, Microparticles, and Nanoparticles

Photoluminescence‐Based Sensing With Porous Silicon Films, Microparticles, and Nanoparticles

Porous Silicon

Optical gain in oxidized porous silicon waveguides impregnated with a laser dye

Contact Info

Product

Resources

About