✦ LIBER ✦

Temperature dependence of localized and free exciton lifetime in CdZnSSe/ZnSSe single quantum wells

✍ Scribed by H. Wang; K.S. Wong; G.K.L. Wong; K.K. Law

Publisher: Elsevier Science
Year: 1998
Tongue: English
Weight: 107 KB
Volume: 24
Category: Article
ISSN: 0749-6036
DOI: 10.1006/spmi.1998.0574

No coin nor oath required. For personal study only.

✦ Synopsis

Time-integrated and time-resolved photoluminescence of Cd 0.3 Zn 0.7 S 0.06 Se 0.94 / ZnS 0.06 Se 0.94 single quantum wells (QW) have been studied. The radiative recombination process is dominated by localized excitons which have a constant lifetime of ∼300 ps when the temperature is less than 130 K. As the temperature increases, localized excitons are thermally activated to form free excitons which are stable up to room temperature because of the large exciton binding energy and strong confinement of electrons and holes in these QWs. Free exciton radiative recombination is thus dominated when temperature is in the 130 K to room temperature (295 K) range. The free exciton decay time of ∼300 ps at 130 K increased linearly to ∼1ns at 295 K. This linear increase in exciton lifetime with temperature agrees with the theoretical prediction by considering the conservation of momentum requirement for radiative recombination for excitons in QW.

📜 SIMILAR VOLUMES

Role of localized excitons in the stimul

Role of localized excitons in the stimulated emission in ultra-thin CdSe/ZnSe/ZnSSe single quantum-well structures

✍ Shigeo Yamaguchi; Hitoshi Kurusu; Yoichi Kawakami; Shizuo Fujita; Shigeo Fujita 📂 Article 📅 1998 🏛 Elsevier Science 🌐 English ⚖ 81 KB

Photo-pumped lasing properties have been investigated in a CdSe/ZnSe/ZnSSE single quantum wells (SQWs) with the well-layer thickness (L W ) of 1, 2 and 3 monolayer (ML). At 20 K, the laser threshold for the SQW with L W = 1 ML was the lowest in spite of the smallest active layer thickness. The carri

Temperature Dependent Dephasing of Excit

Temperature Dependent Dephasing of Excitons and Trions in a ZnMgSe/ZnSe Single Quantum Well

✍ H.P. Wagner; H.-P. Tranitz; R. Schuster 📂 Article 📅 2000 🏛 John Wiley and Sons 🌐 English ⚖ 103 KB 👁 2 views

The temperature dependence of the local

The temperature dependence of the local free volume in polyethylene and polytetrafluoroethylene: A positron lifetime study

✍ G. Dlubek; K. Saarinen; H. M. Fretwell 📂 Article 📅 1998 🏛 John Wiley and Sons 🌐 English ⚖ 310 KB 👁 2 views

Positron lifetime measurements, performed in the temperature range 80-300 K, are reported for polyethylene (PE) and polytetrafluoroethylene (PTFE). The lifetime spectra have been analyzed using the data processing routines LIFSPECFIT and MELT. Two long-lived components appear, which are attributed t

Temperature and Current Dependent Captur

Temperature and Current Dependent Capture of Injected Carriers in InGaN Single-Quantum-Well Light-Emitting Diodes

✍ Hori, A. ;Yasunaga, D. ;Satake, A. ;Fujiwara, K. 📂 Article 📅 2002 🏛 John Wiley and Sons 🌐 English ⚖ 725 KB

Cavity size and temperature dependence o

Cavity size and temperature dependence of stimulated emission in single Zn1 − xCdxSe/ZnSe quantum-well lasers

✍ L. Calcagnile; M. Lomascolo; R. Cingolani; L. Sorba; A. Franciosi 📂 Article 📅 1999 🏛 Elsevier Science 🌐 English ⚖ 49 KB

We observed stimulated emission originating from light-hole transitions in single Zn 1-x Cd x Se quantum-well structures, using high excitation photoluminescence spectroscopy as a function of temperature and cavity length. We found that the lasing wavelength depends on the cavity length, and can be