Light Amplification in an Organic Solid-State Film with the Aid of Triplet-to-Singlet Upconversion

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

Organic laser dyes can be optically excited to achieve light amplification. The buildup of an excessive population of triplets is generally believed to limit the duration of the light amplification because of optical losses through excited-state absorption, so triplet excitons are usually eliminated by using a triplet quencher. However, destroying the triplets limits the electroluminescence efficiency of organic materials under electrical pumping and is counterproductive to realizing electrically pumped organic laser devices. Herein, light amplification is reported which constructively uses triplet states in an optically pumped organic film. In this system, the triplets are converted into singlets by reverse intersystem crossing in a "triplet harvester," and then the singlets are resonantly transferred to the singlet state of the laser dye. Since this approach permits the constructive use of triplets, not only gain-narrowed emission but also enhanced electroluminescence efficiency was observed, indicating that the threshold current density for lasing might be reduced.

Original languageEnglish
Pages (from-to)1381-1388
Number of pages8
JournalAdvanced Optical Materials
Volume3
Issue number10
DOIs
Publication statusPublished - Jan 1 2015

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organic solids
Organic lasers
Amplification
Electroluminescence
organic lasers
solid state
electroluminescence
Pumping (laser)
Threshold current density
Optical losses
Harvesters
Dye lasers
Excited states
Excitons
Coloring Agents
Dyes
organic materials
threshold currents
dye lasers
atomic energy levels

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics

Cite this

Light Amplification in an Organic Solid-State Film with the Aid of Triplet-to-Singlet Upconversion. / Nakanotani, Hajime; Furukawa, Taro; Adachi, Chihaya.

In: Advanced Optical Materials, Vol. 3, No. 10, 01.01.2015, p. 1381-1388.

Research output: Contribution to journalArticle

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