Green/Yellow solid-state lighting via radiative and nonradiative energy transfer involving colloidal semiconductor nanocrystals

Sedat Nizamoglu, Emre Sari, Jong Hyeob Baek, In Hwan Lee, Hilmi Volkan Demir

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


LEDs made of InxGa1-xN and (AlxGa 1-x1-yInyP suffer from significantly reduced quantum efficiency and luminous efficiency in the green/yellow spectral ranges. To address these problems, we present the design, growth, fabrication, hybridization, and characterization of proof-of-concept green/yellow hybrid LEDs that utilize radiative and nonradiative [Förster resonance energy transfer (FRET)] energy transfers in their colloidal semiconductor nanocrystals (NCs) integrated on near-UV LEDs. In our first NC-LED, we realize a color-converted LED that incorporate green-emitting CdSe/ZnS core/shell NCs (λ PL = 548 nm}) on near-UV InGaN/GaN LEDs (λEL = 379 nm). In our second NC-LED, we implement a color-converted FRET-enhanced LED. For that, we hybridize a custom-design assembly of cyan- and green-emitting CdSe/ZnS core/shell NCs (λPL= 490 and 548 nm) on near-UV LEDs. Using a proper mixture of differently sized NCs, we obtain a quantum efficiency enhancement of 9% by recycling trapped excitons via FRET. With FRET-NC-LEDs, we show that it is possible to obtain a luminous efficacy of 425 lm/W opt and a luminous efficiency of 94 lm/W, using near-UV LEDs with a 40 external quantum efficiency. Finally, we investigate FRET-converted light-emitting structures that use nonradiative energy transfer directly from epitaxial quantum wells to colloidal NCs. These proof-of-concept demonstrations show that FRET-based NC-LEDs hold promise for efficient solid-state lighting in green/yellow.

Original languageEnglish
Article number5170075
Pages (from-to)1163-1170
Number of pages8
JournalIEEE Journal on Selected Topics in Quantum Electronics
Issue number4
Publication statusPublished - 2009
Externally publishedYes

Bibliographical note

Funding Information:
Manuscript received December 1, 2008; revised December 24, 2008 and January 20, 2009. Current version published August 5, 2009. This work was supported in part by the Turkish National Academy of Sciences Distinguished Young Scientist Award Program (TUBA GEBIP), in part by the European Science Foundation European Young Investigator Award Program (ESF-EURYI) under Grant EU MOON 02139, and in part by TUBITAK EEEAG under Grant 107E297, Grant 104E114, Grant 106E020, Grant 107E080, Grant 105E065, and Grant 105E066.


  • F̈orster resonance energy transfer (FRET)
  • Green/yellow
  • InGaN/GaN
  • LEDs
  • Nanocrystals (NCs)
  • Nonradiative energy transfer

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering


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